Constructed with 70% merino wool, synonymous with the production of fine soft wool with excellent temperature regulating properties and 30% nylon. For a nod to the traditional look of men's fashion, these socks are featured in an over the calf length making sure you never have to worry about pulling your socks up again. 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.