The Fast Wing HZ short sleeve t-shirt delivers a cracking bundle of technical and practical features. The right combination of fabrics, with a design that spells freedom. Gains durability with the 4Way Stretch woven fabric on the shoulders that stands up to pack abuse. The Aero fabric is a soft knit that sits close and stays discreet. Seams are banned in all pack contact zones and two back pockets are always a bonus. The AdvancedSkin active dry technology grabs moisture and sends it to the surface of your tee where it evaporates, and the long zip at the front gives you the hand on ventilation. Material: Polyester.