The ornamental design for a waterproof shower footwearprotector, as shown and described.
FIG. 1 is a perspective view of a waterproof shower footwear protector with the strap open showing my new design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is another right side elevation view thereof, shown in a used condition on a user's foot; and,
FIG. 7 is another right side elevation view of the waterproof shower footwear protector with the strap closed shown in a used condition on a user's foot.
The broken lines shown in the drawings represent portions of the waterproof shower footwear protector that form no part of the claimed design.
All surfaces not shown form no part of the claimed design.