The Grid, by Trigger Point Performance, is the most versatile and comprehensive foam roller and workout tool available. This revolutionary tool features Distrodensity Zones, a unique matrix of varying widths and densities that allows for a precision massage based on unique and individual needs. Just as a massage therapist uses different parts of the hand and arm to manipulate different muscle groups, The Grid's Distrodensity Foam Zones enable you to apply varying amounts of pressure to help massage and release tight muscles. The Grid can support more than 500 lbs of weight. The Grid is also backed by a 1-year warranty against manufacturing defects. Whether you are 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.