When you want to turn up the intensity, this technical first layer has your back. Moisture-wicking, quick-drying 100% recycled polyester helps you feel airy and cool throughout the day no matter how sweaty the challenge. And long-lasting bio-based HeiQ Fresh treatment reduces odors. For serious days in the mountains, the Ducan FL T-Shirt delivers reliable performance.100% recycled polyester,Treated with HeiQ Fresh FFL - a bio-based technology that reduces unpleasant odors,Quick drying.