We constructed the henley from Merino wool, included a bit of stretch, and a tailored fit. With natural odor resistance, temperature regulation and moisture management these are ready for your next adventure. 6-oz. 19.5 Micron 100% Merino wool. Merino wool provides excellent moisture management, effective temperature regulation, odor control, and stain resistance. Three button, half placket front. Unbreakable Japanese urea cats-eye buttons. Tailored fit and high armhole, meant to be worn as a base layer. Gentle machine wash with cold water and wool detergent. Hang or tumble dry, no heat. Proudly made in California.