American Apparel Men's Tri-Blend Short Sleeve Track Shirt Tri Blend: 50% Polyester, 25% Cotton, 25% Rayon Made in US Machine Wash Tri-blend (50 percent polyester/25 percent cotton/25 percent rayon) construction Polyester retains shape and elasticity; cotton lends both comfort and durability; addition of rayon makes for a unique texture and drapes against the body for a slimming look Durable rib neckband Fits slimmer than our 2001