ROTOTO's signature three pack socks consists of a pair of chunky rib socks, a pair with a pile sole and a pair entirely lined with pile fabric. All the pairs are made of undyed organic Acala cotton, but designed differently. You can therefore choose a right pair according to your outfit each day, while enjoying the tender feel of organic cotton daily. It's also a perfect gift idea. * Avoid tumble drying, as it may cause shrinkage. ITEM NUMBER R1123 MATERIAL 83%COTTON、14%POLYESTER、3%POLYURETHANE COUNTRY OF ORIGIN Japan