Under Armour Men's Optic Stripe HeatGear Golf Polo Shirt Polyester/Elastane Revolutionary coldblack technology reflects IR and heat rays, so even dark colors dont get as hot Soft knit fabric provides lightweight performance, for comfort from the links to the clubhouse Mesh underarm panels deliver strategic ventilation Signature Moisture Transport System wicks sweat away from the body Anti-odor technology prevents the growth of odor causing microbes