These revolutionary, patent-pending tools with ridges are designed for hands-free myofascial release, deep-tissue massage and stabilization exercises. The Wraps are easily attached to standard 6" round foam rollers, allowing you to enhance your existing foam roller investment. Designed to support varying degrees of tissue mobilization, the Foam Roller Wraps are available in four successive colors of progressive density, with Yellow (X-Soft) providing extra cushion for more delicate patient populations through Blue (X-Firm) for advanced fascia mobilization.