Under Armour ColdGear Armourvent Run Beanie Nylon/Polyester Moisture Transport System - Wicks sweat away from the body, leaving you comfortable and dry. Double-layer ArmourVent Mesh - Supplies true breathability when called upon. Dual-layer Fabric - With an ultra-warm, brushed interior and a slick, fast-drying exterior. Reflective Graphics and Logo - For greater visibility in low light settings. Nylon/Polyester