A breathable merino wool-blend technical top designed to naturally regulate your temperature, control odor and keep you comfortable when you’re working hard in the widest range of conditions. Made with Responsible Wool Standard (RWS) wool certified by Control Union (TE-00052557), we blend the RWS wool with 35% recycled polyester for versatility and performance. The purchase of RWS-certified products demonstrates demand for better animal welfare practices and responsible land management in the wool supply chain. Made in a Fair Trade Certified™ factory. The Men's Long-Sleeved Capilene® Cool Merino-Blend Shirt is fully backed by our Ironclad Guarantee and you can find it on Patagonia.com. | Patagonia Men's Long-Sleeved Capilene® Cool Merino Blend Shirt in Black, Small - Hiking Shirts - Recycled Polyester/Wool