Patagonia Merino Wool Blend Crew Socks Lightly cushioned for comfort, our 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 a blend that offers exceptional breathability, rugged durability, plus excellent stretch and recovery that lasts the lifetime of the socks. Engineered for Comfort - Engineered patterning on top of the foot provides added breathability and stretch Low-Calf Coverage - Crew-length coverage reaches up to the lower calf for a secure fit with most footwear Arch Brace - Mesh arch brace provides a snug fit Soft, Airy Footbed - Terry-loop footbed provides soft, airy cushioning across the bottom of the foot Made in the USA - Made at a family-run factory in the United States