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. Un-dyed organic cotton ankle socks with a soft brushed sole. Each pair naturally fits into your wardrobe regardless of season and occasion. Knitted with naturally colored cotton (Chamen), the gray color is created by a chemical reaction on rare pale green cotton (Midorimen), while applying a plant dying method called mordanting to fix the color. The color was born as a by-product of a study to prevent Midorimen cotton from color fading by sunlight because the material inherently has low color fastness to light. Contains 3 pairs of socks: 1 light grey, 1 dark grey, 1 ecru Material: 95% Cotton, 4% Polyester, 1% Polyurethane Size M = 8 to 10 Size L = 10 to 12 Made in Japan Avoid tumble drying, as it may cause shrinkage.