DESC: Extra strength velcro and separations allow for a snug fit that will stay in place even if you don't Durable High Quality Neoprene and Velcro: Physical Therapy Quality product at a great price. Great for Tennis Elbow, Sore Necks, Sprained Wrists/Ankles, Joint Pain, Migraine Headaches and more. Self-insulating Roll-n-go design: freeze product and take it with you - Stays cold for 4-6 hours. Same product used by Physical therapists. Athletic trainers and Professional Atheletes