Constructed with 73% Super 120s Merino Royale, synonymous with the production of fine soft wool with excellent temperature regulating properties and 27% Nylon. For the everyday man, the function of a mid-calf sock fits in perfect with his plans, making his look versatile for a day at the office, night out on the town, or anything in between. All Pantherella socks have fine-linked toes for seamless comfort and reinforced heels and toes for durability. Mens sock sizing: - Medium fits 8.5 -11 foot, - Large fits 11.5 - 13 foot. Made in England by Pantherella, the premier hosiery and sock brand since 1937.