Lightly cushioned for comfort, our Merino Wool-Blend Crew Socks are designed for a long life on the trail. They're made with Responsible Wool Standard (RWS) wool certified by Control Union (TE-00052557). We blend the RWS wool with nylon and spandex to create exceptional breathability, rugged durability, and excellent stretch and recovery that lasts the lifetime of the socks. The purchase of RWS-certified products demonstrates demand for better animal welfare practices and responsible land management in the wool supply chain. The Merino Wool-Blend Crew Socks is fully backed by our Ironclad Guarantee and you can find it on Patagonia.com. | Patagonia Merino Wool-Blend Crew Socks in Viking Blue, Large - Nylon/Polyester/Spandex