AMRAP Nutrition Unisex Branded Tri-Blend Track Shirt Unisex Tri-Blend Track T-Shirt Tri-Blend (50% Polyester / 25% Cotton / 25% 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