ThermaCare Lower Back & Hip HeatWraps are specially designed to fit your back and hip area so you can experience long-lasting heat relief throughout your day. Unlike creams and rubs that mask the pain, only ThermaCare has patented heat cells that penetrate deep to increase circulation to promote healing, while relieving pain for up to 16 hours. That's 8 hours of heat while you wear it, plus an additional 8 hours of relief after you take if off. So you don't just feel better, you get better. ThermaCare HeatWraps deliver therapeutic healing exactly where you need it. Whether it's muscle or joint aches, strains, sprains or arthritis that's causing your pain, look to ThermaCare to find relief. elivers heat deep into tissue, warming the muscle right where it hurts—to relax, soothe and unlock tight muscles Patented heat cells get right to the source, to stop pain and accelerate healing Enhanced elasticity for a better fit Allows you to move freely while delivering therapeutic heat Thin enough to wear discreetly under clothing Flexible enough to be worn on the move or while relaxing Available in L/XL (Dimensions: 35 inches to 47 inches)