80% Combed Cotton, 17% Polyamide, 3% Elastane. Made in Portugal using 200 needles, the most advanced craftsmanship, to produce some of the finest seamless socks on the market. Wash inside out (40ºC/100ºF max). Do not tumble dry, iron. L: 41-46 UK (7½-11½) US (8-12). M: 36-40 UK (4-7) US (4½-7½).