With its innovative, seamless, 3-D knit structure, the Capilene® Air Bottoms offer amazing warmth and comfort range. An airy blend of 51% RWS-certified merino wool and 49% recycled polyester wicks moisture, resists odor and dries in a flash. 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.