Feather Ice Insert for Cooling Vest

Made from safe, non-toxic, non-flammable, and non-combustible silica crystals that freeze like ice. Reusable packs deliver a constant temperature of 54°F for up to 3 hours. The lightweight, pliable powder conforms to your body when frozen.  Activated by freezing in a freezer. 13-1/2"L x 6"W x 2-1/2"H. 4/pack.