This PERformance Roller Expanded Polyethylene (EPE) foam roller is excellent for relieving aching muscles before, during, or after workouts. Use your own body weight to help increase blood flow and circulation to the soft tissues. Target multiple trigger points to perform self-myofascial release to improve springiness and range of motion, and shrink pain and soreness. EPE foam is a high quality material with 1.9lb per cubic foot density and made in the U.S.A. It will not breakdown or lose its shape after moderate to heavy use.