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 well. The Grid features: "Green" technology Constructed with less foam than traditional foam rollers Designed to withstand constant, heavy, and repeated use without breaking down Built from EVA foam The Matrix & Distrodensity Zones Unique design allows for targeted massage: Find the Distrodensity Zone that best suits your needs Distrodensity allows for a more realistic massage experience Core body workout versatility Use The Grid to achieve a comprehensive core body workout From crunches to bicycles to pushups - use it to challenge core muscles Incorporate it into daily workout routines Compact; travel with it and workout anywhere