An all-season first layer that's cool in warm weather and easy to layer-over as the temperature drops. More versatile than a t-shirt or long underwear top, the GSX Ultra-Form Base Long-Sleeve Crew uses high-tech fabrics to manage moisture, odor, and body temperature. This highly technical shirt offers a stretch nylon elastic neck binding, raglan sleeves, flatlock seaming, and thumbhole cuffs for unparalleled comfort all day long. Shell is made of lightweight 92% polyester, 8% Lycra GSX stretch fabric. Underarms, front and back side panels, upper back yoke, and sleeve cuffs are made of super-lightweight 100% micro polyester mesh fabric designed to wick moisture away from the skin, so you stay dry when the heat is on. GSX heat transfer logo at center-back neck. Imported.