Sock

FIG. 1 is a right side rear perspective view of a sock showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side rear perspective view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a left side view thereof.

The broken lines depicting the remainder of the sock form no part of the claimed design.