Thera-Roll 3.5"x12" Hard Thera-Roll foam roller helps increase strength, improve balance, and assists in self-massage. Dense closed cell foam with 3/8"H firm ridges helps relieve muscle tightness and enhances ability to target specific trigger points during self-massage. Ridges also offer a stable environment for high-risk users during balance training and add a tactile element to any core strengthening program. Closed cell foam resists dirt and wipes clean, promoting a cleaner appearance longer than with traditional foam rollers. Durable Protecta Foam core resists compression for extended wear.