HENCHGRIPZ™ GYM WEAR T - BACK / Y-BACK / RACERBACK / STRINGER BODYBUILDING VESTS Our HENCHGRIPZ™ Racer Back Vests are made from 100% cotton, no cheap polyester, thin shoulder straps, and deep side scoops. Chest Size S = 40" M = 43" Size L = 46" XL = 49"