Lower Back & Hip Heat Wraps Large-Extra Large 2-Count Deep penetrating heat. Relaxes tight muscles. Long lasting pain relief. Patented heat cells penetrate deep. 8 hours of heat. Air-activated one-time use. Choose the right size ThermaCare back/hip wrap for you. Large and Extra Large: Women's Pant Size: Size 9 up to size 20; Men's Pant Size: 35 to 47 in. Indications Provides heat therapy for temporary relief of minor muscular and joint aches and pains associated with overexertion strains sprains and arthritis. Directions 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. Warnings This product can cause burns. 55 or Older: your risk of burning increases as you age; wear ThermaCare over a layer of clothing not directly against your skin; do not wear while sleeping. Check skin frequently during use. If you find irritation or a burn remove product immediately. Do not use if heat cell contents leak and/or wrap is damaged or torn; for more than 8 hours in a 24-hour period; with pain rubs medicated lotions creams or ointments; on unhealthy damaged or broken skin; on areas of bruising or swelling that have occurred within 48 hours; on areas of the body where you can't feel heat; with other forms of heat; on people unable to remove the product including children infants and some elderly; on people unable to follow all use instructions. Ask a doctor before use if you have diabetes; poor circulation or heart disease; rheumatoid arthri