Inspired by hearty mountain climbing socks, these Rototo socks are like a sweatshirt. The double-layered "Double Face" design, is a process that allows for different materials to be knitted on the outside and the inside of the sock to utilize different thread properties. Using this production technique, merino wool on the outside and thick looped-back organic undyed cotton on the inside creates a comfortable texture and gives the joy of organic cotton against your skin. These double face socks have been in ROTOTO’s collection since the establishment of the brand. 80% Organic Cotton/15% Merino/ 4% Polyester/ 1%Polyurethane Style R1001 Inside Cotton Outside Merino Made in Japan