The official Bystander Revolution t-shirt is screen-printed on the Tri-Blend Short Sleeve Track Shirt made by American Apparel® in Athletic Grey. 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 slim fit.