The GRID Foam Roller is the ultimate workout tool designed to tone your body and give your muscles a targeted massage experience. From athletes to yoga enthusiasts, this EVA foam roller challenges your core with a more effective workout. It features a Matrix Technology and Distrodensity Zones™ to relieve minor aches and pains after intense training routines. Roll your way to better health and away from injury with The GRID Foam Roller. SPECS: Product Dimensions: 13” L x 5” D Features a patented multi-density foam surface delivering firm compression Constructed of EVA foam for durability Tested to withstand weights up to 500 pounds Rigid, hollow core maintains shape with repeated use BENEFITS: Training and therapeutic foam roller for intense core workout and targeted massage Matrix Technology and Distrodensity Zones™ to relieve minor aches and pains Great workout tool for crunches, bicycles, push-ups and more Compact design for easy storage and travel Releases muscle pain and tightness and improves mobility Increase circulation and range of motion Recommended by sports doctors, chiropractors, and physical therapists Ideal for beginner to advanced foam rollers Suited for non-athletes and athletes alike Targets key muscle areas where knots and kinks are common