What's it do? 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 - 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 - Adjustable strap closure - Updated, larger back opening for multiple ways to wear your hair - One Size Fits Most - Style #: 1383445 - Raised silicone logo - 100% Polyester - Imported