The Thermawool Long-Sleeve Crew Shirt is made from 100% mercerized super soft merino wool jersey. The superfine merino wool fabric naturally manages moisture and temperature, insulating even when wet, and fights off odor with natural antimicrobial properties. No-itch wool is not only soft and warm, but also flame resistant and machine washable with a UPF rating of 50+ to protect your skin from harmful UV rays. Merino wool is an annually renewable resource. This breathable 180g fabric is constructed with flat seams, so that the Crew Shirt functions perfectly as a medium weight base layer. Thermawool Long-Sleeve Crew Shirt has a crew neck, set-in sleeves, and ribbed trim. Black.