The TriggerPoint GRID 1.0 Foam Roller is a multi-density physical therapy essential that delivers firm compression from intense workouts. This foam roller is made of durable EVA foam with a hollow core and proprietary Distrodensity zones that with every roll feel like a message which helps promotes airflow and oxygen. It features a patented GRID pattern that aids in targeting muscle pain, and tightness so you can perform at your best during workouts. The TriggerPoint GRID 1.0 Foam Roller is the best feel great for all your pre- or post-workouts!