The Cozy-Stretch Wide-Leg Sweatpant is made of a premium blend of responsibly sourced wool, recycled nylon, yak, and a touch of spandex, which makes it both cozy and stretchy (hence the name). This combination allows for an extra-comfortable feel and surprisingly durable design. Need we say more? The wool in this sweatpant is certified by the Responsible Wool Standard, which ensures the welfare of the sheep and the land they graze on.