Includes one box of two ThermaCare Heat Wraps advanced back pain therapy lower back & hip air activated Heat WrapsSpecially designed to fit your back and hip area with enhanced elasticity for a better fit and more targeted reliefDelivers heat deep into tissue, warming the muscle right where it hurts - to relax, soothe and unlock tight musclesProvides up to 16 hours of pain relief (8 hours while you wear it, 8 hours after you take it off)Allows you to move freely while delivering a therapeutic heat while being discreet under clothing