Designed to be the most effective foam roller on the market, every detail on the R4 Body Roller was considered by ROLL Recovery. The size, surface texture, material density and shape were optimized to target specific muscle groups. The key focus points are the centre groove to align with the spine and neck, along with a profile to help loosen tight IT bands, calf muscles and many other areas of the body. Feedback from elite athletes and physical therapists were crucial to the development of the R4 Body Roller. Features Spine and neck alignment centre groove. Unique diamond pattern for better grip Designed to alleviate IT-Band tightness by targeting surrounding muscles. Center support in the core to maintain strength and stiffness where needed. Tech Spec Size: 45.7cm x 15.2cm Weight: 1.17 kg Outer: Proprietary High-density EVA Foam Core: Engineered ABS