I claim the ornamental design for a protective vest, as shown and described.
FIG. 1 is a perspective view of a protective vest according to an embodiment of the present invention;
FIG. 2 is a front view of the protective vest of FIG. 1;
FIG. 3 is a rear view of the protective vest of FIG. 1;
FIG. 4 is a left side view of the protective vest of FIG. 1, wherein a right side view of the protective vest is a mirror image of the left view and is therefore not shown;
FIG. 5 is a top view of the protective vest of FIG. 1; and,
FIG. 6 is a bottom view of the protective vest of 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.