The ornamental design for a snap-on top for footwear, as shown and described.
FIG. 1 is a top perspective view of a snap-on top for footwear, showing my new design;
FIG. 2 is a top perspective view a snap-on top for footwear, in an unfastened configuration;
FIG. 3 is a bottom perspective view thereof;
FIG. 4 is a top perspective view a snap-on top for footwear, in an unfastened configuration of use;
FIG. 5 is a top perspective view a snap-on top for footwear, in a fastened configuration of use;
FIG. 6 is a right side perspective view thereof; and,
FIG. 7 is a left side perspective view thereof.
The broken line showing of printed stars on the upper surface of the top in FIG. 1, FIG. 2, and FIGS. 4-7, and the broken line showing of the sole base with the loops in FIGS. 4-7 illustrate environment and form no part of the claimed design.