Three-dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygen, the nutrients needed to repair muscles Proprietary Distro density® zones replicate the feeling of a massage therapist's hands Ideal for beginners to advanced rollers, the Eco GRID releases muscle pain and tightness, improves mobility, and increases circulation to help move and feel better EVA foam makes it firmer than traditional foam rollers Length: 5.5 inches Weight limit: 500 lbs