Fabrication Enterprises, Cold Pack Relief Pak ColdSpot General Purpose Oversize 11 X 21 Inch Urethane Reusable, 1 EachProduct Description An effective cold therapy for sprains & strains, muscle soreness, bruises, swelling and tension headache Cool pack in a chilling unit or freezer Packs remain pliable and soft even below freezing Maintains its therapeutic cold for up to 30 minutes Made of a durable heavy duty urethane exterior which can be chilled to a lower temperature than other packs, and a bentonite clay interior Use with a cold pack cover, sold separately, or a