ThermaCare Knee & Elbow Pain Therapy Heat Wraps are designed with added flexibility that not only moves with you but stays securely in place. Patented heat cell technology penetrates deep into tissue to relieve pain and accelerate healing. Improved heat cell orientation provides healing relief exactly where you need it. Patella hole design adapts to knee and elbow movement. Wider straps keep wrap in place for a better, more secure fit.