The GRID massage roller from TriggerPoint features a foam surface with multiple densities built on a hollow core. It is ideal for treating tight muscles, knots, and kinks. The patented Distrodensity zones mimic the feel of a masseur's hands and promote blood and oxygen flow, which are essential nutrients for muscle repair. The foam roller is suitable for both beginners and advanced users. The GRID foam roller alleviates muscle pain and tension, improves mobility, and increases circulation, allowing users to move more easily and feel better. The GRID is robustly constructed with a multi-layer EVA foam outer material over a stiff, hollow core to withstand repeated use while maintaining its shape and integrity. TriggerPoint helps individuals of all lifestyles move more easily and feel better. TriggerPoint designs and develops innovative massage tools that replicate the touch of a therapist's hands, making their foam rollers, hand rollers, massage sticks, and balls ideal for people of all ages, sizes, and athletic abilities.