The foundation of your cold weather system, GSX Thermal Hybrid 1/4-Zip is our high-tech replacement for long underwear. Worn alone or underneath wind or rain layers, GSX thermals use comfortable, synthetic fabrics that dry quickly and keep the wearer warm during periods of low activity. The multi-panel construction consists of soft, brushed 100% polyester thermal fabric with lightweight 92% polyester, 8% Lycra GSX stretch fabric at the underarms, front and back side panels, and upper front and back sleeves. Strategically placed grid-pattern fleece traps air for more warmth with less bulk. Four-way stretch fabric. Wicking properties of all component fabrics help keep you dry. Anti-microbial treatment helps reduce odor. With features like raglan sleeves, flatlock seaming, and elastic-bound cuffs with thumbholes to keep sleeves in place when adding layers. Vertical zippered powermesh pocket at left chest stretches to twice its size for plenty of storage space. GSX heat transfer logo at center-back neck. Imported.