High Density Foam Roller. Created by Occupational therapists. Closed-cell, heat molded foam technology allows the OPTP PRO-ROLLERTM to withstand the heaviest of usage. With a firm density and textured surface, this attractive marble roller excels at proprioceptive, balance and stability exercise. The cross-linked, closed-cell structure is guaranteed not to breakdown and increases sanitary conditions with easy cleaning between patients/clients. Alleviates back pain. Great for pilates.