Our Hot and Cold Gel Packs help reduce swelling that causes pain. When used as a cold therapy, it provides fast first relief for acute soft tissue injuries, and other conditions that require cold applications to reduce bruising, swelling and pain. When used as a hot therapy, it provides long lasting soothing relief. It is a great source of muscle relaxation; increasing blood flow to promote healing. It can also be used to soothe arthritis pain. Features: It is the perfect solution to help relieve strains, sprains, headaches and other soft tissue injuries. This versatile gel pack can be cooled in the freezer in as little as one hour, or warmed in the microwave/hot water in as little as 50 seconds.