Board for carrying a person across snow

Abstract

The disclosure herein is directed toward systems and methods for supporting a person and enabling motion of a person across a surface of snow while satisfying the countervailing requirements of increasing surface area for weight-carrying capacity on soft snow and reducing the opposing forces, like for example drag and friction, in hard snow. More specifically, a snowboard described herein includes an inner edge and an outer edge, and allows the rider to control the amount of board-to-snow contact. This snowboard is configured to improve rider support, increase speed and enhance safety performance.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application a snow board snowboard and these two rails are separated by a recess, so that the two rails are arranged to place one along each side of the snowboard. The rails have a bottom surface that contacts the snow. Under certain operating conditions, such as when the snow is compact and firm enough to prevent or reduce the rails from sinking more than a few millimeters into the snow, the snowboard moves over the snow with the rails in contact with the snow surface and the recessed portion of the board spaced away from the compact snow surface.

Optionally, the rails may have a tapered surface. The taper may progress from the interior side of the rail adjacent to the recess toward the peripheral edge of the board. The taper spaces the peripheral edge of the board away from a flat surface on which the rails may rest. The tapered surfaces are examples of a contoured lower surface having dual rails.

Among other features, the contoured lower surface may sink lower in soft snow and ride higher in hard snow. The amount of area contacting the snow adjusts based on, in part, the rider's speed, weight and the snow conditions. The rails on the lower surface may optionally be sloped up toward the periphery of the board and may reduce the likelihood of unintentionally catching an edge in the snow, and thereby improve stability.

DETAILED DESCRIPTION

FIG. 1 depicts a prior art snowboard 100 designed to support the weight of a person and to enable motion on snow. The snowboard 100 contains at least one rigid element, wherein each rigid element has an upper surface (not shown), a lower surface 203 and one or more stiffened peripheral edges 101(a) and (b) 101a and 101b. Edges 101(a) and (b) 101a and 101b are located on left and right ends and, in some embodiments, may line the entire periphery of the system. Edges 101 101a and 101b may be made of metal, alloy or any other suitable material.

FIG. 2 depicts a cross-sectional detail of the prior art snowboard of FIG. 1. The snowboard 100 has an upper surface 201, a lower surface 203, and a plurality of inner-layers 202 positioned between the upper surface 201 and lower surface 203. Edges 101(a) and (b) 101a and 101b are located on left and right ends, respectively. The lower surface 203 rests on the snow surface 204. The downward force 206 is transferred through the system 100 and is balanced by the normal force 207.

Upper surface 201 may be made of a glossy material, which serves as a medium to place graphic designs and also a UV protectant layer. Lower surface 203 is typically a polyethylene and serves to reduce friction between the bottom of the system and the surface of travel. Inner-layers 202 are made of hardwood placed in between layers of fiberglass.

During operation, the snowboard 100 reaches a physical equilibrium state wherein the normal force 207 is equal to downward force 206. The downward force 206 is determined, in part, by weight of the person on the snowboard 100. The normal force 207 is distributed across the snow 204 on an area of snow-to-board contact (not shown), which is determined, in part, by the width of snow-to-board contact 205. For the prior art snowboard, the width of contact 205 remains constant even as the downward force 206 increases.

FIG. 3 depicts one embodiment of the snowboards described herein. Specifically, FIG. 3 depicts the lower surface of a snowboard having two rails separated by a recess. As shown, the snowboard 300 has an upper surface (not shown), a lower surface 305, and one or more stiffened peripheral edges 304(a) and (b) 304a and 304b, which are located on the left side and right side of the board, respectively. The peripheral edges 304a and 304b may form a single edge that surround surrounds the full periphery of the snowboard 300. Alternatively, in other embodiments, the edges 304a and 304b are separate edges on opposing longitudinal sides of the board. The lower surface 305 is continuous across the rails 301 301a, 301b and a recessed region 302 is arranged between the two rails 301a and 301b. In some embodiments, the board is laminated from a series of layers. Typically the layers are wood, fiberglass and/or plastic, although other materials may be employed. These form the inner structure of the snowboard 300 and the inner layers (not shown) may be contoured in a shape that is similar to that of the lower surface 305. In other embodiments, the inner layers (not shown) may be formed as a generally flat board and the rails 301 301a, 301b may be distinct components of the system that are attached separately to the lower surface 305. In either case, the contour of the lower surface 305 may be similar. When in use, the system makes contact with the snow across the width of contact 306 306a, 306b.

The dimensions of the snowboard 305 300 may vary, and typically will be between 90-170 cm in length as measured along a longitudinal axis extending along the length of the snow board 305 snowboard 300 and between 20-30 cm in width as measured along a beam axis extending perpendicular to the longitudinal axis. The snowboard 305 300 has a generally hourglass shape, with curved lateral sides. Typically, both the front end and the back end are curved upward to lift the ends of the snowboard off the surface of eh the snow when the lower surface 305 is placed on the snow surface. Other dimensions and shapes may be used without departing from the scope of the invention. FIG. 4 depicts a cross-sectional detail of one embodiment of the snowboards described herein. According to one embodiment, system 300 has an upper surface 401 and a lower surface 305. The lower surface 305 is continuous across the left rail 301(a) 301a, the recessed region 302 and the right rail 301(b) 301b. Stiffened peripheral edge 304(a) 304a and edge 304(b) 304b are located at the left end and right ends sides, respectively. The downward force 406 is determined, in part, by weight of the person using the snowboard. The normal force 407 is distributed across the snow 404 on an area of snow-to-board contact (not shown), which is determined, in part, by the width of snow-to-board contact 305 306a, 306b. As the downward force 406 increases, the width of contact 305 306a, 306b may also increase.

Likewise, as the downward force 406 decreases, the width of contact 305 306a, 306b may also decrease. In operation, the snowboards described herein adjust to varying snow conditions. In soft snow, the board sinks lower in the snow thereby increasing the width of contact 306 306a, 306b, which increases the normal force supporting the rider. In some soft snow conditions, the width of contact 306 306a, 306b may be large enough to include the entire width of the lower surface 305, including the surface area of rails 301 301a, 301b and the recessed region 302. In hard snow, the snowboard may rise toward the top of the surface and thereby decrease the area of contact 306 306a, 306b. In some hard snow conditions, the width of contact 306 306a, 306b may be small and may only include the peak of rails 301(a) and (b) 301a and 301b and not the surface of the recessed region 302. For conditions in between the soft and hard, the amount of board-to-snow contact varies as needed, such that the downward force 406 is equal to the normal force 407.

Turning to FIGS. 3 and 4, the rails 301 301a, 301b run the length of the board. Thus, the length of contact is not altered relative to the conventional design but the width of contact is decreased. By keeping the length of contact between the system and the snow constant, and by decreasing the width of contact between the system and the snow, the claimed system is able to attain higher speeds on snow than a conventional system. Not to be bound by theory, but the snowboard having the two rails on the bottom surface, may be faster than a conventional snowboard. For the same physical principles that a pair of skis is faster than a standard snow board snowboard of the same length, and a catamaran is faster than a mono-hull boat of the same length.

Also depicted in FIG. 4, the twin rails 301, 301a, 301b may optionally not be rectangular in shape. Instead, they maybe may be angled upwards from the peak of the rail towards the periphery of the board. Thus, the rails have a tapered surface that progresses from the interior of the board to the peripheral edge. This design feature raises the edges 304 304a, 304b up above the snow when the operator is initiating a turn while operating the snowboard. The raised edges allow the user to travel on width of contact 306, 306a, 306b without fear of unintentionally catching an edge. The result is increased comfort and, in part, safety and stability at high speeds. To initiate a carving turn, the rider must rotate the claimed system slightly further than the conventional system, ensuring that any edge-to-snow contact is intentional.

FIG. 5 depicts the snowboard of FIGS. 3 and 4 placed on a snow surface that is less firm and compact than the snow surface of FIG. 4. Specifically, FIG. 7 5 illustrates the snowboard 300 disposed over a snow surface 404. A force 406, typically the weight of the Rider rider, pushes the snowboard 300 against the snow surface 404. In the conditions represented by FIG. 5, the rails 301(a) and 301(b) 301a and 301b press more deeply into the snow surface 404 than under the conditions depicted by FIG. 4. The areas of contact 306(c) and 306(d) 306c and 306d of the rails 301(a) and 301(b) 301a and 301b against the snow 404 are larger than the areas of contract 306(a) and 306(b) contact 306a and 306b depicted in FIG. 4. In still less firm conditions, the snow 404 may contact the recessed region 302 and press against the snowboard 302 300, at the rails 301(a) and 301(b) 301a and 301b and at the recessed regions.

FIG. 6 depicts the lower surface 305 of the snowboard 300 and partially depicts binders and boots of a rider. As shown, the binders or bindings grip the rider's boot and hold the boot on the upper surface of the snowboard 300. The binding is arranged to position the heel of the boot 602 over one rail 301b and a toe of the boot (not shown) over a different rail 301a. To turn, the rider can lean forward or back to tip the snowboard 300 onto an edge 304 304a, 304b to carve a turn into the snow.

FIG. 7 depicts a cross-sectional detail of one embodiment of the claimed system designed to support and to enable motion for a person across a surface of snow. The cross section of FIG. 7 is one alternative to the cross section of FIG. 4. The lower surface 505 is continuous across the left rail 501(a), the recessed region 502, and the right rail 501(b). Edges 504(a) and 504(b) are located on the left side and right side of the board, respectively. Rails 501 501(a), 501(b) extend along the full length of the long axis of the board and are raised relative recessed region 502. In an alternative embodiment rails 501 501(a), 501(b) may only extend a portion of the length of the board. Recessed region 502 rises up to a lofted running surface, allowing the amount of surface area in contact with snow 510 to vary based on, for example, the type of snow (e.g., hard snow, soft snow), the weight of the user, the action performed by the user (e.g., slightly turning, sharply turning), the stance of the user (e.g., squatting stance, standing up straight, leaning). Inner edges 503(a) and 503(b), which form a first edge located on the lower surface of the board rise up from surfaces 506(a), 506(b) of rails 501 501(a), 501(b) up to a flat region of the lower surface of the board followed by outer edges 504(a) and 503(b) 504(b). Outer edges 504(a) and 504(b) form a second edge located at a periphery of the upper surface. The first edge is thus at a different vertical location than the second edge, with the first edge being lower than the second edge as shown in FIG. 7. The first edge is also closer to the longitudinal axis than the second edge. The surface 507(a), 507(b) of the board located between the first or inner edge and the second or outer edge is concave, such that this portion of the board surface is not in direct contact with the snow on the ground, and. Inner edges 503(a) and 503(b) form soft edges and are made of the same material as the bottom surface of the board (e.g., p-tex). Outer edges 503(a) and 503(b) 504(a) and 504(b) form hard edges and are made of a stiff material (e.g., metal, rigid plastic).

The combination of the inner and outer edges allows the rider or user to control the amount of board-to-snow contact. When the outer hard edges 504(a) and 504(b) engage the snow, a full carve or stop can be obtained. Having both the hard edges and the soft edges allow allows users to break contact between the snow and the hard edge which has a higher coefficient of friction, and to obtain contact between the snow and the soft edge, with a lower coefficient of friction. These inner or soft edges 503 503(a), 503(b) allow users to ride without catching an edge and can be used to drift, ‘butter,’ turn and surf the snow. When a user leans the board beyond the soft edge, the outer hard edges 504(a) and 504(b) can once again engage the snow. For experienced users, the inner edges increase the ability to perform tricks, and flat spins without engaging the outer edges. The inner edges also benefit beginning snowboarders by allowing them to learn in a more intuitive and forgiving manner, resulting in less fewer injuries.

System 500 outperforms a conventional system in acceleration, maneuverability, and versatility based, in part, on the above features. Inner edges 503(a) and 503(b) sit below and inside of outer edges 503(a) and 503(b) 504(a) and 504(b). The “soft” inner edges 503(a) and 503(b) allow the rider to make small adjustments to direction without engaging the corresponding hard outer edge 503(a) or 503(b) 504(a) and 504(b) with the snow. In addition, inner edges 503(a) and 503(b) allows allow the rider to drift their board without catching an edge (i.e. without unintentionally engaging hard outer edge 503(a) or 503(b) 504(a) and 504(b)) which feels smooth to the user, much like the carve of a surfboard. When the rider chooses to turn sharply or come to a stop, they may engage the hard outer edge 503(a) or 503(b) 504(a) and 504(b). When traveling on hard snow (e.g., hard-packed snow) the board (e.g., systems 300, 500) rides up on the rails thereby reducing the surface area in contact with the snow and thus reducing drag, allowing the rider to accelerate faster, and attaining higher maximum speeds. When traveling on soft snow (e.g., powder-like snow), the board sinks down slightly thereby increasing the surface area in contact with the snow and generating greater support for the user. Thus, the board enables a user to easily transition between different types of snow (e.g., hard snow, soft snow) by rising or sinking in the snow. The board performs well both as a race board (e.g., for high acceleration and speed) and in soft snow based, in part, on the variable surface area in contact with the snow. When used in a snowboard half-pipe, the board affords a user the ability to accelerate more quickly and reach high speeds faster than conventional systems, which yields improved performance (e.g., higher jumps, more time in the air after a jump to perform tricks). The design of the edges (e.g., edges 304, 503, 504 304a, 304b, 503(a) 503(b), 504(a) 504(b), or the combination thereof) provides a more forgiving surface when landing tricks, similar to the reverse camber design, but it does not sacrifice “pop” like reverse camber does. Moreover, the increased acceleration rate allows a user to recover more quickly after an error than conventional systems.

The shape of the board also allows the board to be stronger and thinner than conventional snowboards. Strength and durability of the board are improved, while the board is thinner and thus lighter than standard adult snowboards. The cross-section of the board includes four sigmoid, or s-shape surfaces: between outer edge 504(a) and inner edge 503(a), between surface 501(a) 506(a) and recess (502), between recess (502) and surface 501(b) 506(b), and between inner edge 503(b) and outer edge 504(b). These s-shaped surfaces provide sidewalls that extend orthogonally, or substantially orthogonally, to the upper surface of the board. This provides the board with a shape that increases the board's resistance to shear forces acting to crack or break the board along a line that is traverse transverse to the sidewalls. Additionally, these s-curve surfaces may act as springs, storing potential energy when the board is flexed, and causing the board to produce significant ‘pop’ quickly. Advantageously, the shape of the board eliminates chatter at high speeds.

The inner edges 503(a) and 503(b) are offset from the hard edges 504(a) and 504(b), respectively. Inner edges 503(a) and 503(b) may be between 8 and 11 mm closer to the board's longitudinal axis than outer edges 504(a) and 504(b).

The thickness of the board varies both transversely, as shown in the cross-section of FIG. 7, and longitudinally. In the longitudinal direction the board is thickest where the rider's feet are located, and gradually thinner both to the left and to the right of the rider's feet, i.e. closer to the ends of the board. Accordingly, as shown in FIG. 7 the thickness varies between 1.5 mm and 6.5 mm at the longitudinal axis, and the thickness of the rails 501(a) and 501(b) varies between 3 and 8 mm.

Empirical research has shown that a board with the features described above can accelerate up to 25% faster than a standard board. Empirical research has also shown that this board is 1.5 to 2 times stronger than a standard board, and the risk of breakage is significantly reduced.

Those skilled in the art will know or be able to ascertain using no more than routine experimentation, many equivalents to the embodiments and practices described herein. For example, the claimed system and the knowledge disclosed herein may be utilized to modify or to create systems designed to carry a person or objects across a surface of water, sand, or other materials. More specific example applications may include, among other things, snowboards, water skis, wake boards, kayaks, winder surfers, or paddle boards.

The manufacture of the disclosed snow board snowboard may be accomplished employing methods that are familiar to those skilled in the art. For example, the layers of the disclosed snowboard may be constructed, in part, using a mold, which is designed having a shape consistent with the contours of the claimed system. Other example manufacturing methods may have an expandable bladder, placed in an enclosure with the layers of the system and the mold. As the bladder expands, it applies pressure to the layers, forcing them against the mold and imparting the contours of the mold. In some embodiments of a manufacturing system struts, made of wood, are used to help distribute the pressure from the bladder to the layers of the system. In other embodiments of a manufacturing method, the layers of the system may be pressed together using a pneumatic press, which applies pressure to the layers, forcing them against the opposing surface of the press and imparting the contours of the claimed system.

In other embodiments, the layers of the system are attached to one another using adhesives, epoxy, or other suitable attachment systems. Those skilled in the art will know or be able to ascertain using no more than routine experimentation, many equivalents to the embodiments and practices described herein. For example, the claimed system and the knowledge disclosed herein may be utilized to modify or to create systems designed to carry a person or objects across a surface of water, sand, or other materials. More specific example applications may include, among other things, snowboards, water skis, wake boards, kayaks, winder surfers, or paddle boards.

Accordingly, it will be understood that the invention is not to be limited to the embodiments disclosed herein, but is to be understood from the following claims, which are to be interpreted as broadly as allowed under the law.

Claims

1. A snowboard, comprising:

a board having an upper surface and a lower surface, a first edge and a second edge, and a first and second end,

the upper surface having locations for a first binding and a second binding to allow the bindings to be arranged transverse to a longitudinal axis extending through the first and second ends,

the lower surface having a first and a second rail extending along the longitudinal axis and being separated by a recess extending along the longitudinal axis, the rails and the recess each having a width measured transverse to the longitudinal axis and the width of the recess being greater than the width of each respective rail, and the first and second rails and the recess extending substantially a length of the lower surface, and

the second edge being located at a periphery of the upper surface, and the first edge being located on the lower surface and closer to the longitudinal axis than the second edge,

wherein the first and second rails have surfaces for contacting a snow surface, the first and second rail surfaces being tapered to narrow a thickness of the respective rail from the recess to the first edge of the board.

2. The snowboard according to claim 1, wherein a surface of the board between the first edge and the second edge is concave.

3. The snowboard according to claim 1, wherein the first edge is made with a first material, and the second edge is made with a second material, and wherein the second material is stiffer than the first material.

4. The snowboard according to claim 1, wherein when the boards rests on a flat surface the first edge is in contact with the flat surface, and the second edge is raised above the flat surface.

5. The snowboard according to claim 4, wherein the second edge is raised between about 1 mm and 8 mm above the flat surface.

6. The snowboard according to claim 1, where the first and second rails have respective interior shoulder walls having an at least 30° inclination from an axis parallel to a beam of the board.

7. The snowboard according to claim 1, wherein the first and second rails have a width substantially equal to one quarter the width of the lower surface.

8. The snowboard according to claim 1, further comprising

a binding for gripping a boot of a rider, and

wherein the binding is arranged to position a heel of the boot over one rail and a toe of the boot over a different rail.

9. The snowboard according to claim 1, wherein the first and second rails comprise modular bodies for being secured to the lower surface of the board.

10. The snowboard according to claim 1, wherein the first and second rails comprise rails integrally formed as part of the lower surface of the board.

11. The snowboard according to claim 1, wherein the width of the rails is selected to support a weight of a user, and thereby have a surface of the recess apply a force less than the weight of the user to a snow surface.

12. A method of manufacturing a snowboard, comprising providing a board having an upper surface and a lower surface, a first edge and a second edge, and a first and second end,

arranging on the upper surface locations for a first binding and a second binding to allow the bindings to be arranged transverse to a longitudinal axis extending through the first and second ends, and

forming on the lower surface a first and a second rail extending along the longitudinal axis and being separated by a recess extending along the longitudinal axis, wherein the rails and the recess each have a width measured transverse to the longitudinal axis and the width of the recess being greater than the width of each respective rail and the first and second rails and the recess extend substantially a length of the lower surface,

wherein the second edge is located at a periphery of the upper surface, and the first edge is located on the lower surface and closer to the longitudinal axis than the second edge, and

wherein the first and second rails have surfaces for contacting a snow surface, the first and second rail surfaces being tapered to narrow a thickness of the respective rail from the recess to the first edge of the board.

13. A snowboard An apparatus for carrying a person across a surface of snow, comprising:

a board having an upper surface and a lower surface, a first edge and a second edge, and a first and second end,

the upper surface having locations for a first binding and a second binding to allow the bindings to be arranged transverse to a longitudinal axis extending through the first and second ends,

the lower surface having a first and a second rail extending along the longitudinal axis at least a portion of a length of the board and being separated by a recess extending along the longitudinal axis, the rails and the recess each having a width measured transverse to the longitudinal axis and the width of the recess being greater than the width of each respective rail, and the first and second rails and the recess extending substantially a length of the lower surface, and the lower surface having first edges and second edges, each of the first and second rails having a respective one of the first edges, each of the second edges disposed at a periphery of the lower surface on a respective side of the longitudinal axis, the lower surface configured such that if the first and second rails rest on a flat surface, the second edges will be displaced further from the flat surface than the first edges, and such that each first edge is a soft edge defined by a first edge portion of the lower surface that will extend away from the flat surface as the first edge portion extends away from the longitudinal axis,

each of the second edge edges configured to provide engagement with a snow surface with a first coefficient of friction, and

each of the first edge edges configured to provide engagement with the snow surface with a second coefficient of friction when the second edge is not engaged with the snow surface, wherein the second coefficient of friction is lower than the first coefficient of friction,

wherein the first and second rails have first and second rail surfaces, respectively, for contacting a snow surface, the first and second rail surfaces being tapered each having a concave portion to narrow a thickness of the respective rail from the recess to between the respective first edge and the respective second edge of the board.

14. A board for carrying a person across a surface of snow, comprising

an upper surface and a lower surface, with a centerline extending longitudinally along a length of the board, and being sized for supporting the person traveling across the surface of snow,

a first and a second end, and

a first and a second side each of which extends between the upper surface and the lower surface,

the lower surface including a first snow contact surface disposed laterally from the centerline on a first side of the centerline and a second snow contact surface disposed laterally from the centerline on a second side of the centerline opposite the first side of the centerline, including first and second inner edges disposed on the first and second sides of the centerline respectively, and including first and second outer edges disposed on the first and second sides of the centerline respectively,

the first and second inner edges being spaced laterally away from the first and second outer edges, respectively, towards the centerline, and

each of the first and second outer edges being located at a respective peripheral edge of the board,

wherein the lower surface includes first and second s-shaped surfaces extending from the first and second snow contact surfaces to the first and second outer edges respectively, each of the first and second inner edges comprising an inner-edge portion of the first s-shaped surface and the second s-shaped surface respectively, such that a thickness of the board diminishes from the first and second snow contact surfaces toward the first and second outer edges respectively and such that if the first and second snow contact surfaces rest on a flat surface, then the first and second outer edges will be disposed further above the flat surface than the first and second inner edges, and

wherein the first and second snow contact surfaces comprise a first material, the first and second inner edges comprise the first material, and the first and second outer edges comprise a second material that is different from the first material.

15. The board of claim 14, wherein the first s-shaped surface includes a concave portion and a flat portion between the first inner edge and the first outer edge.

16. The board of claim 14, wherein the first outer edge comprises an outer-edge portion of the lower surface, and a portion of the first side extends from the outer-edge portion of the lower surface.

17. The board of claim 14, wherein the second material has a higher coefficient of friction than the first material.

18. The board of claim 14, wherein the second material comprises one of a metal or a rigid plastic material.

19. The board of claim 14 wherein the first material comprises polyethylene.

20. The board of claim 14, wherein the first and second s-shaped surfaces are configured such that if the first and second snow contact surfaces rest on a flat surface, then the first and second outer edges will be disposed between 1 mm and 8 mm above the flat surface.

21. The board of claim 14, wherein the board has an hourglass shape with the first and second sides being curved inward toward the longitudinal axis.

22. The board of claim 14, wherein the board comprises a snowboard or a ski.

23. A method of manufacturing a board for carrying a person across a surface of snow, comprising

forming the board to include a first and a second end, an upper surface and a lower surface, with a centerline extending longitudinally along a length of the board, and a first side and a second side each extending between the upper surface and the lower surface,

forming the lower surface to include a first snow contact surface disposed laterally from the centerline on a first side of the centerline and a second snow contact surface disposed laterally from the centerline on a second side of the centerline opposite the first side of the centerline, to include first and second outer edges disposed on the first and second sides of the centerline respectively and disposed at respective peripheral edges of the board, and to include first and second inner edges disposed on the first and second sides of the centerline respectively and spaced laterally away from the first and second outer edges and towards the centerline, and

forming the lower surface to include first and second s-shaped surfaces extending from the first and second snow contact surfaces to the first and second outer edges respectively, each of the first and second inner edges comprising an inner-edge portion of the first s-shaped surface and the second s-shaped surface respectively, such that a thickness of the board diminishes from the first and second snow contact surfaces toward the first and second outer edges respectively and such that if the first and second snow contact surfaces rest on a flat surface, then the first and second outer edges will be disposed further above the flat surface than the first and second inner edges,

wherein the first and second snow contact surfaces comprise a first material, the first and second inner edges comprise the first material, and the first and second outer edges comprise a second material that is different from the first material.

24. The method of claim 23, wherein the second material has a higher coefficient of friction than the first material.

25. The method of claim 23, wherein the first s-shaped surface includes a concave portion and a flat portion between the first inner edge and the first outer edge.

26. The method of claim 23, wherein the first and second s-shaped surfaces are formed such if with the first and second snow contact surfaces rest on a flat surface, then the first and second outer edges will be disposed between 1 mm and 8 mm above the flat surface.

27. The method of claim 23, wherein the board comprises a snowboard or a ski.