Nexcare Cold Hot Classic Gel Compress Can Be Used Cold Or Hot And Is An Excellent Solution For Those Who Prefer Natural, Drug-Free Therapy. You Can Store The Pack In The Refrigerator Or Freezer So It Is Always Ready To Use For Cold Application To Reduce Swelling, Inflammation And Pain. Use The Microwave Or Hot Water To Warm It Up And Apply To Reduce Muscle Spasm, To Decrease Pain, Soothe And Relax. The Gel Is Safe And Non Toxic To Use And Also 99% Biodegradable* Which Makes The Product Now More Environmentally Friendly