The ornamental design for a top and bottom of a protective mat, as shown and described.
FIG. 1 is a top plan view of a top and bottom of a protective mat showing
our new design; and,
FIG. 2 is a bottom plan view thereof.
The cross hatching and broken lines along the edges in the figures
represents stitching, and the pattern partially shown for ease of
illustration is understood to continue across the entire area as indicated
.