The Dickies TH50100 Base Layer Vest is a modern variation on the classic thermal vest in the latest technical bamboo yarn. 65% bamboo, 30% tencel, 5% spandex(180gsm). This top is designed to wick moisture away from the body, keeping you comfortable in all temperatures. The high bamboo fibre content gives this garment built in anti-bacterial properties. crew neck, ribbed cuffs, contrasting flat stitching for comfort. The Dickies TH50100 Base Layer Vest matches the TH50000 Long John.