Breathable technical merino wool top designed for natural temperature regulation odor control and comfort during strenuous work in a variety of environments. Made from an RWS certified merino wool blend 65% and 35% recycled polyester. All Patagonia natural wool sources are certified to the Responsible Wool Standard (RWS) from farm to fiber which helps provide protection to both the animals that provide it as well as the land they graze. Made in factory fair trade certified.