The ornamental design for a boot warmer, as shown and described.
This application is one of three being filed on the same day in the name of the same inventor claiming three different designs for generally similar products.
FIG. 1 shows a top plan view of a boot warmer showing my new design, the bottom view being essentially similar;
FIG. 2 shows a right side elevational view, the left side elevational view being essentially similar;
FIG. 3 shows a front elevational view thereof; and,
FIG. 4 shows a rear elevational view thereof.
The invention is of an ornamental design for a boot warmer, comprising a quantity of clay, sand, or similar substance(s) encased in one or more bags sewn of fabric or like material. The boot warmer of the invention is used by heating it in a microwave oven or otherwise and placing it in a ski boot or the like to warm it prior to being worn.