Under Armour Cap - This cap was designed to keep your head cool by removing excess heat through special vents that let warm air out, but are small enough that the sun's rays are no problem Under Armour Technologies : armourvent technology provides maximum breathability in a lightweight, stretchy, durable and quick-drying fabric The iso-chill elastic band helps disperse body heat, making it feel cool to the touch. Specifications: material wicks sweat and dries really fast Adjustable back closure. Premium Materials - 100% Polyester Fit: UA classic fit: features a pre-curved visor and structured front panels that maintain shape with a low profile fit