Lower back pain is a common health problem and a leading cause of activity limitation. ThermaCare® is a non-medicated heat patch designed to provide therapeutic heat that penetrates deep into the muscle tissue – increasing the blood flow to the affected area, to relieve pain, relax and unlock tight muscles. ThermaCare® Heat patches have been clinically proven to provide up to 16 hours of relief. That’s 8 hours while you wear it and up to 8 hours after you take it off. ThermaCare® Heat patches are – Specially designed to fit your lower back and hip area. Thin enough to wear discreetly under clothing. Allows you to continue your daily activity while delivering therapeutic heat.