The ornamental design for a cuff for boot, as shown and described.
FIG. 1 is a front elevational view of a cuff for boot showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a side view, taken from the right side of FIG. 1, the left side view being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The evenly spaced broken lines shown on the surface of the claim represent unclaimed stitching; the dash-dot-dot-dash broken lines showing a boot in FIG. 3 represent environment. The broken lines form no part of my claimed design.