Pantherella Asberley Silk Blend Over the Calf Mens Formal Dress Socks 70% Silk, 30% Nylon Blend Supportive over the calf length Reinforced, fine linked toe for seamless comfort and durability. Plain foot bottom for added comfort 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