UA Classic Fit: Features a pre-curved visor and structured front panels that maintain shape with a low profile fit. Stretch Construction: Provides a comfortable and adaptable fit. Iso-Chill Sweatband: Helps disperse body heat, making the hat feel cool to the touch. ArmourVent? Technology: Delivers ultimate breathability with a lightweight, stretchy, durable, and fast-drying fabric. 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.