Trigger Point The Grid 2.0 Foam RollerThe GRID 2. 0 foam roller is designed with proprietary Distrodensity zones. This three dimensional surface has a variety of widths to replicate the feeling of a massage therapists hands. Three dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygenthe nutrients needed to repair muscles Hard, hollow core hand wrapped in EVA foam makes it firmer than traditional foam rollers Environmental design uses less foam