M’s Long-Sleeved Capilene® Cool Merino Graphic Shirt. A breathable merino 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 from a blend of 65 % RWS-certified merino wool and 35 % recycled polyester. All of the virgin wool Patagonia sources is certified to the Responsible Wool Standard (RWS) from farm to fiber to help ensure protection both for the animals that supply it and the land they graze. Fair Trade Certified™ sewn.