FEATURES: GRID(R) pattern varies pressure applied to muscles Can aid in faster muscle recovering by increasing blood flow and oxygen to muscles Designed to provide a targeted, deep tissue massage in hard to reach areas especially on shoulders, traps and hips Replicates the feeling and pressure of a massage therapist's hands applied to the muscles Extra firm EVA foam retains shape after repeated use Features 3 different surface patterns offering a variety of texture compress to release muscle tension SPECS: Dimensions: 5-inch diameter Firmness: Extra Firm Material: EVA Foam Easy-to-clean Lightweight and portable making it perfect for travel or trips to the gym