The size, surface texture, material density and shape were optimized to target specific muscle groups. The key focus points are the center 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.

• Spine and neck alignment center 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.
• 18" x 6" (45.7cm x 15.2cm).
• 2.6 lbs (1.17 kg).
• Proprietary High-density EVA Foam.
• Core: Engineered ABS