Top Performance Socks for running and cycling. Made with ECONYL® Nylon: 100% Regenerated yarn made from nylon waste otherwise polluting the Earth like fishing nets, fabric scraps, carpet flooring and industrial plastic rescued from all over the world. High quality, breathable and lightweight material: L size 38 gr; M size 37gr. Compressive double-layered cuff. Ergonomically Optimized Right/Left Fit. Seamless Toe to prevent chafing. Widespread Mesh to wick sweat away from the foot. Arch support. Reinforced Toe and Heel Area. Mid-calf socks: L size - 20 cm leg length; M size - 18 cm leg length. Quick-Drying material. Designed in Spain, produced in Portugal.