ROTOTO 1625 Comfy Room Check Socks in Dark Red/BlackROTOTO 1625 Comfy Room Check Socks. A very thick knit and soft inside. 43% Acrylic, 30% Wool, 12% Nylon,12% Polyester, 3% Polyurethane Machine Wash Avoid Tumble Drying, as it may cause shrinkage. Made in Japan ROTOTO Crafted and designed in Japan, RoToTo uses traditional and modern manufacturing techniques, to create the ultimate cool comfort sock with the tag line have a good feel. These socks are the epitome of style and fit.