The GRID foam roller is for anybody who wants to move better and can be used for a self-massage and roll through the tight muscles, knots and kinks that prevent feeling good and moving wellA three-dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygen, which are 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 limit: 500lbs