Under Armour ArmourVent Adjustable 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.

Under Armour has incorporated ArmourVent technology into the cap's construction to allow maximum breathability to keep you cool and dry. ArmourVent also wicks away excess sweat and moisture that builds up to leave your skin feeling cool, dry and comfortable as you strive for the best results and performance. The technology is also durable and fast-drying to ensure a healthy environment for you to thrive. An Iso-Chill sweatband helps disperse heat, making it feel cool to the touch - so you can focus on your performance. A pre-curved visor conforms to the shape of your head to keep the sun's rays from your eyes so your vision isn't impaired and finally, an adjustable strap closure enables you to alter the fit of the cap to a more personal one.