Perfect for elevating your sock collection or as a gift, the Rototo Special Trio Sock offer a selection of superior quality socks. Crafted in Japan, Rototo prides themselves on excellent craftsmanship and making socks that are built to last. An easy way to upgrade any outfit. Small - UK 4-6, Medium UK 6-8, Large - UK 8-11. Made in Japan. MATERIALS Sock 1: 93% Cotton 5% Nylon 2% Polyurethane. Sock 2: 65% Wool 20% Cotton 12% Nylon 2% Polyurethane 1% Polyester. Sock 3: 80% Cotton 15% Wool 4% Nylon 1% Polyester.