Under Armour Men's ArmourVent Low Stretch Fit Hat - 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. UA low: Classic low-profile baseball cap with structured front panel—maintains contact with head ArmourVent Technology delivers ultimate breathability in a light, stretchy, durable & fast-drying fabric Iso-Chill sweatband helps disperse body heat, making it feel cool to the touch Stretch construction provides a comfortable fit 100% Polyester Style: 1383438