ThermaCare HeatWraps offer convenient heat therapy for muscle and joint pain relief. These large/X-large wraps are designed to comfortably fit your lower back, hips, legs, or shoulders with a waist circumference of 35 to 47 inches. They provide up to 8 hours of soothing heat with an air-activated design, ideal for temporary pain relief from overexertion, strains, sprains, and arthritis. ThermaCare's patented heat cells penetrate deep into tissues to relax and loosen tight muscles, promoting healing. These wraps are thin and flexible, allowing for discreet wear under clothing and comfortable movement while delivering therapeutic heat.