For the beginner to advanced user, the Grid Foam Roller helps work through the tight muscles, knots, and kinks that prevent feeling good and moving well. This roller is for anyone who simply wants to move better. The GRID roller is designed with a three-dimensional surface of varied widths meant to replicate the feeling of a massage therapist's hands. This GRID roller's pattern allows tissue to relax as you roll and promotes the flow of blood and oxygen responsible for carrying nutrients needed to repair muscle. The GRID's hard, hollow core is wrapped in EVA foam, making it firmer than traditional foam rollers and uses less foam with its environmental design. The GRID roller measures 13 inches long and 5.5 inches in diameter and has been weight tested to support up to 500 pounds of static load, making it travel-friendly and highly durable.