The GRID - Orange Constructed with less foam than traditional foam rollers; built from EVA foam, The GRID has been designed to withstand constant, heavy, and repeated use without breaking down. The Grid; is also backed by a 1-year warranty against manufacturing defects. Dimensions - 13" x 5" (330mm x 127mm) Forget everything you've ever known about traditional foam rolling - The GRID is here, and it's going to take foam rolling to a whole new level. The GRID has been designed for athletes and people of all types; from long distance runners and endurance athletes to major sports players and yoga enthusiasts. Whether you're looking to massage your lats, quads, lower back, or any other large muscle group, or trying to achieve a killer core body workout, The GRID™ is certain to suit your needs. The GRID is the most versatile and comprehensive foam roller and workout tool available. The unique Matrix and Distrodensity Zones design allows for targeted massage with a more realistic experience.