I claim the ornamental design for a protective vest, as shown and described herein.
FIG. 1 is a perspective view of an embodiment of the ornamental design of a protective vest;
FIG. 2 is a front view of the protective vest shown in FIG. 1;
FIG. 3 is a rear view of the protective vest shown in FIG. 1;
FIG. 4 is a left side view of the protective vest shown in FIG. 1;
FIG. 5 is a right side view of the protective vest shown in FIG. 1;
FIG. 6 is a top view of the protective vest shown in FIG. 1; and,
FIG. 7 is a bottom view of the protective vest shown in FIG. 1.
The broken lines shown in the FIGS. are of the remainder of the protective vest, provided for illustrative and environmental purposes only and form no part of the claimed design.