The ornamental design for a burn belt, as shown and described.
FIG. 1 is a top perspective view of a burn belt;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a rear elevation view thereof; and,
FIG. 8 is a top perspective view of the burn belt, shown in use.
The evenly spaced broken lines in FIG. 8 illustrate a wallet/personal item protruding from a pocket and are environmental subject matter. The evenly spaced broken lines that form a rectangle on the bottom left area of the burn belt in FIGS. 1, 2, 4, and 8 illustrate a portion of the burn belt that forms no part of the claimed design, with the space within the rectangle not claimed. All other evenly spaced broken lines in the figures illustrate portions of the burn belt that form no part of the claimed design. The dash-dot broken lines in FIGS. 1, 3, 5, and 8 are boundary lines that illustrate the bounds of the claimed design, and form no part thereof.