The Roll Recovery R4 Deep Tissue Body Roller isn’t your average foam roller! Everything about the design of the R4 serves the purpose of optimizing recovery of specific muscle groups the center groove aligns with the spine and neck to give your back muscles a more secure massage. and also helps to keep the IT band loose by kneading the muscles surrounding it. preventing it from becoming overstretched. The diamond pattern on the R4 helps give the roller a secure grip both on the floor and your body. ensuring you get a stable. deep massage without worrying about sliding around. It’s perfect for keeping muscles in the legs and back loose. expediting recovery and helping to decrease the risk of overuse injuries.