Mueller has been a leader in Sports Medicine for nearly 50 years, and they know the importance of using both hot-and-cold therapy in dealing with strains, sprains, and muscle ache. Their Hot/Cold Therapy wraps are designed to be durable and easy to use. Available in two sizes, the wraps are made of a heavy-duty, durable material with a hook-and-loop closure. The gel pack insert can be used for either cold therapy to reduce swelling, or heated up to promote circulation and help loosen tight muscles.