cotton or 90/10 cotton/poly Pull On closure Machine Wash Warm This bodybuilding t shirt features the classic Powerhouse Gym Bent-Bar logo screen-print. Available in a variety of colors so its a great workout clothing item for inside the fitness center or to wear as a muscle shirt for casual use outside. Most of the Powerhouse Gym shirts are made from 100% cotton with the exception being the 90/10 Grey. Like all other workout clothing available through Best Form, Powerhouse Gym shirts may be exchanged/returned within 30 days. Returns are subject to a 20% re-stocking fee.