Fitvana Foam Roller with patented ZAG design - Durable Firm Foam perfect for pre and post workouts as well as stretching core muscles&Ecirc; PERSONAL MASSAGE THERAPY: Perform targeted muscle massage and increase circulation without the assistance of other! Designed to stretch muscle and soft tissue to help relieve soreness, stiffness, and muscle pain, shortening recovery times and minimizing the risk of injuries. UNIQUE ZAG TECHNOLOGY: Developed by a former professional athlete and personal trainer, ZAG technology takes super-effective grid foam rolling to the next level! ZAG grooves give muscles a deeper massage and work with your bodys anatomy for maximum benefit. DURABLE, HIGH QUALITY EVA FOAM: Made from high-density extra firm EVA foam with a hollow plastic core for superior support for any health, wellness, sports, or exercise regimens. Smooth foam surface makes it easy to clean. PORTABLE, EASY TO CARRY SIZE: Small enough to store at home, but large enough to get the job done. Add foam rolling to your normal home routine or pack in the included travel bag for training on the go. BEST VALUE ON AMAZON! Fitvana builds ZAG foam rollers to last! We back every product with our 365-day Money Back Guarantee!