Engineered for superior performance, the R4™ Body Roller is built with purposeful design from end to end. Its dimensions, contouring, and foam density are carefully crafted to deliver targeted relief to major muscle groups. A central groove helps cradle the spine and neck, while its sculpted edges are ideal for releasing tension in the IT band, calves, and other tight areas. Input from top athletes and physical therapy professionals played a major role in shaping the final design, ensuring an efficient and effective recovery tool.