Soothe an unwanted injury with this hot and cold gel pack. For relaxing heat therapy microwave the non-toxic gel pack, or to keep it cool, put it in the freezer. The elastic strap allows you to be hands-free when you secure it on your wrist or ankle. Available in black and red. Gel pack can be microwaved for heat therapy or put in the freezer before use for cold therapy. Elastic strap allows the non-toxic gel pack to be secured around wrist to keep it cool.