We claim the ornamental design for an arm sling, as shown and described.
FIG. 1 is a perspective view of our new design in an arm sling, in a closed condition;
FIG. 2 is a left elevation view of our new design in the arm sling of FIG. 1;
FIG. 3 is a right elevation view of our new design in the arm sling of FIG. 1;
FIG. 4 is a front elevation view of our new design in the arm sling of FIG. 1;
FIG. 5 is a back elevation view of our new design in the arm sling of FIG. 1;
FIG. 6 is a top plan view of our new design in the arm sling of FIG. 1;
FIG. 7 is a bottom plan view of our new design in the arm sling of FIG. 1; and,
FIG. 8 is a perspective view of our new design in an arm sling, in an open condition.
The evenly dashed broken lines on claimed surfaces depict stitching and form no part of the claim. The dash-dot-dash lines depict portions of the strap of the arm sling and of the puller loop of the arm-sling that form no part of the claim. The triangular area outlined in dash-dot-dash lines in FIGS. 1 & 8 is not normally visible during use and forms no part of the claim.