FIG. 1 is a perspective view of our new design for a protective sleeve;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a top view thereof; and

FIG. 6 is another side view thereof.

FIG. 7 is a perspective view of a second embodiment of our new design for a protective sleeve;

FIG. 8 is a front view thereof;

FIG. 9 is a back view thereof;

FIG. 10 is a side view thereof;

FIG. 11 is a top view thereof; and,

FIG. 12 is another side view thereof.

The broken lines shown in FIGS. 6 and 12 are included for illustrative purposes only and form no part of the claimed designs.