Under Armour Women's Ua Fly Fast Luminous 1/2 Zip Machine Wash Smooth, Soft Fabric - Delivers a light, fast feel and incredible next-to-skin comfort. Brushed Interior - Circulates heat for optimum temperature regulation. Signature Moisture Transport System - Draws perspiration away from the skin, through the mid/outer later where it is evaporated. Generous  zip - Allows the wearer to determine their own level of ventilation. Stand Collar - Provides added coverage and protection from the cold.