Beat the heat in the Under Armour Men's Iso-Chill ArmourVent Stretch Fit Hat. The Iso-Chill sweatband gets rid of heat to keep you cool, and the ArmourVent technology promotes flex and airflow. A pre-curved visor helps keep sunlight out of your face, and the polyester fabric feels soft on your skin. Under Armour Men's Iso-Chill ArmourVent Stretch Fit Hat Castlerock/Castlerock, Medium/Large - Men's Athletic Hats at Academy Sports