American Apparel Tri-Blend, Tri-Blend (50% Polyester / 25% Ring-Spun Cotton / 25% Rayon) construction, Tri-Oatmeal (50% Polyester / 37% Ring-Spun Combed Cotton / 13% Rayon), 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.