Cryo-MAX reg; Cold Packs have been designed with a unique, technological design that allow the cold pack to remain cold for up to eight hours. The large size Cryo-MAX cold pack is 12" x 12", comes with an adjustable support wrap with velcro straps and is recommended for use on the elbow, foot, face or hands. Non-toxic, washable. Use the CryoMAX large cold packs for back pain, knee aches, hip and thigh ailments, and more. The oversized ice packs contour to any affected area by remaining pliant even when frozen.