Highly cushioned for comfort and built for a long life, our Heavyweight Merino Wool-Blend Knee Socks are engineered for warmth in cold conditions. They&';re made with Responsible Wool Standard (RWS) wool certified by Control Union (TE-00052557). We blend RWS wool with nylon and spandex for 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. Product Features: Patterning on the top of the foot provides added breathability and stretch Knee-length socks reach to the high calf for a secure, no-droop fit that&';s engineered to handle the stresses of wading boots Mesh arch brace provides a snug fit Terry-loop footbed provides soft, airy cushioning across the bottom of the foot Reinforced heel and toe are designed for added durability Made at a family-run factory in the United States Support fibers are all solution-dyed, significantly reducing the need for water in the creation process compared to conventionally dyed fibers Product Specifications: Fabric: 84% Responsible Wool Standard (RWS)-certified wool certified by Control Union (TE-00052557)/15% nylon/1% spandex sock yarn. The RWS verifies wool animal welfare and land management requirements and tracks it from farm to final product Weight: 6.5