Intense training requires a cool head and that's when you've got to rely on the UNDER ARMOUR Iso-Chill ArmourVent™ Stretch cap. Made with a combo of woven nylon, woven polyester, and elastane, this hat has a structured fit, mid crown, slightly curved bill, and a six panel construction and an Iso-Chill sweatband with front panel lining that effectively wick away sweat and promotse ventilation. The ArmourVent™ Technology provides superior breathability.