The RAD Helix flushes out toxins and enhances your back’s range of motion with its anatomical shape that’s designed to protect the spine. Your foam roller definitely can’t do that. Oh, and did we mention it’s also killer on calves, quads, hamstrings and hips? Dimensions: 12.5″ x 3″. Materials: High-density foam. Color: Gray. Unit weight: 1 lb. Comes with PDF guide of exercises.