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.FEATURES:-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.