Nontoxic Ice It! packs freeze faster, maintain low temperature longer, and stay flexible when frozen, to mold around painful areas for optimum therapeutic benefit. Fully removable Comfort-Flex™ cover retains cold longer, protects skin from tissue damage due to hypothermia and prevents condensation. Foam cushion is soft and gentle on painful areas. Comfort-Flex™ design shapes to your body, for close contact and maximum benefit. Hook-and-loop at both ends of the strap enable it to be fully detachable. The strap, with generous width for stability and length for virtually unlimited positioning options, allows the user to maintain activities during cold therapy. For knees and shoulders. . WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov