The GRID foam roller is for anybody who wants to move better. Use the GRID for a self-massage and roll through the tight muscles, knots and kinks that prevent feeling good and moving wellThe GRID foam roller is designed with proprietary Distrodensity zones. This three-dimensional surface has a variety of widths to replicate the feeling of a massage therapist’s handsThree-dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygen—the nutrients needed to repair musclesHard, hollow core hand-wrapped in EVA foam makes it firmer than traditional foam rollersEnvironmental design uses less foam than traditional foam rollersCompact and travel-friendlyWeight tested to support up to 500 lbs/225 kg static load