Jack Frost™ Instant Insulated Hot Pack in a single-use disposable package.
To use, just:
Shake contents to bottom of pack. Grasp outer edges of pack where indicated and squeeze firmly to activate. Knead pack well to mix contents after activation. Full instructions on package.
Insulated on one side for comfortable use. Becomes ~110 degrees for 45 minutes of use.
Long shelf life keeps product usable through extended storage. No heat source required. Contents are food-grade and non-toxic.