BEWARE OF IMITATIONS!! ONLY THE GRID X TRIGGER POINT ROLLER IS BUILT TO LAST!!Forget everything you've ever known about traditional foam rolling - The Grid X is here, and it's going to take foam rolling to a whole new level.Dense tissue needs a firmer GRID foam roller to release and relieve aches and pains. The GRID X can be used to release the calves, quadriceps, hamstrings, back and lats. Advantages for Functional Fitness athletes: Twice as firm as the original GRID foam roller Sweat proof and simple to clean Three-dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygen—the nutrients needed to repair muscle Compact and travel-friendly Weight tested to support up to 250kg static load Perfect for dense tissue and anyone who prefers intense compression. The unique design of The Grid X by Trigger Point allows for targeted massage. The Grid X contains distrodensity zones that allow for a more realistic massage experience from your roller. The Grid X by Trigger Point is built to last and designed so that the foam does not break down through heavy use.The Grid X by Trigger Point can be used for a core workout. Incorporate it into your crunches, bicycles and pushups to challenge your core muscles.Designed for all types of athletes from Gym goers to footballers to yoga enthusiasts, The Grid X foam roller is as versatile as it is fashionable. Three zones: Low and Flat - Feels like the palm of the hand or forearm High and Firm - Feels like the finger tips Medium and Tubular - Feels like the fingers and thumb Dimensions: Length: 13inches (33cm) Diameter: 5.5inches (14cm)