Mountain Hardwear MHW AC Henley Top - SS17 100% Polyester Imported Poly-Blend Fabric - Lightweight, packable and fast drying material. All-over Perforation - Offers exceptional breathability. Wick-Q Technology - Wicks away moisture from the skin to leave you feeling cool and dry. Hidden Button Placket - Offers additional coverage from cold or extra ventilation. Weight - 66g