GRID STK foam roller, the world’s first handheld foam roller, uses a patent-pending GRID 3-dimensional surface, mirroring a massage therapist’s hands: low and flat like the palm, tubular like the fingers, and high & firm like the fingertips. The foam roller helps releasing tight muscles and knots, improving mobility. The 3-dimensional surface is designed to channel blood and oxygen while rolling, improving circulation for faster muscles’ recovery. Extra firm density “X” provides restorative treatments for intense aches, pains, addressing toughest troubled spots of the body, ideal for individuals preferring extra firm compression. AcuGRIP handles are ergonomically shaped, grip muscles to apply pressure easily. Ideal for upper and lower body including hamstrings, quads, tib anterior and traps. Water-resistant and easy to clean. To be used while standing or seated.