Small vents in the Under Armour Iso-Chill ArmourVent Adjustable Cap dump excess heat to keep you cool while still protecting from the sun. ArmourVent technology promotes superior breathability and comfort thanks to light, stretchy, durable polyester construction, and fast-drying properties. Iso-Chill sweatband disperses body heat, making it feel cool to the touch. Use the adjustable strap closure on this UA Iso-Chill cap to customize the size. Pre-curved visor and structured front panels maintain shape with a low-profile fit. Imported.Manufacturer style #: 1383440. 100% polyester ArmourVent technology promotes superior breathability Light, stretchy, and durable construction Fast-drying properties Iso-Chill sweatband disperses heat