Trigger Point The Grid X Foam RollerThe GRID X foam roller is our firmest foam roller. It was created to break through the body's toughest, tightest trouble spots for relief from intense aches and pains. Description 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. Twice as firm as the original GRID foam roller Sweat proof and simple to clean Three dimensional surface