Under Armour Iso-chill Armour Vent Cap Add a staple accessory to your everyday attire with the Iso-chill Armour Vent Cap from Under Armour. Made from a Nylon blend fabrication, this cap details an Armour Vent technology to deliver ultimate breathability in a light, stretchy and fast-drying construction. With an Iso-Chill sweatband and front panel lining to help disperse body heat, this cap provides ultimate comfort, perfect to wear for any occasion. Complete in a solid block colour with a Under Armour branded logo for instant brand recognition.