The ornamental design for a sheetmaterial, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
26 is a plan view of a sheet material, showing the design.
The drawing depicts one repeat unit of the claimed design; it is understood that the design repeats uniformly both vertically and horizontally.