ThermaCare Heat Wraps are specially-designed with patented heat cells that deeply penetrate heat to relax sore, tight muscles. Providing pain relief when needed the most, the long-lasting heat wrap provides up to eight hours of superior heat and pain relief. Includes one large/extra-large lower back and hip heat wraps for a one-time use.Features & Benefits: Patented heat cells get right to the source, to stop pain and accelerate healing Specially designed to fit your back and hip area Enhanced elasticity for a better fit Allows you to move freely while carrying therapeutic heat Thin enough to wear discreetly under clothing Suggested Use: Tear open pouch when ready to use. Place on pain area on lower back or hip with darker heat cells towards skin. If 55 and older, wear over a layer of clothing, not directly against your skin. It may take up to 30 minutes to reach therapeutic temperature. Adjust for comfort. Do not over-tighten. Wear up to 8 hours. Do not wear for more than 8 hours in any 24-hour period. Place wrap flat. Do not fold or bunch as your risk of burn is increased. UPC: 305733010037 Weight: 0.61 lbs