Our eBay Store Under Armour 1383438 Men’s UA Iso-Chill ArmourVent Stretch Hat Baseball Cap This hat was designed to keep your head cool by dumping excess heat through special vents that allow hot air out, but are small enough that the sun’s rays aren’t an issue. Product DNA:UA Classic Fit: pre-curved visor & structured front panels that maintains shape with a low profile fitArmourVent® Technology delivers ultimate breathability in a light, stretchy, durable & fast-drying fabricIso-Chill sweatband helps disperse body heat, making it feel cool to the touchStretch construction provides a comfortable fit100% PolyesterImported