RoToTo 1513 Kasuri Ribbed Crew Socks in Gray/BlackRoToTo 1513 Kasuri Ribbed Crew Socks in Gray Black. These ribbed socks are knitted with a mix of multi color Kasuri dyed yarn and ROTOTOs exclusive organic cotton slub yarn co developed with a spinning company. The complex shades of Kasuri dyeing and the uneven surface of slub yarn make each item look unique and distinct. The fabric has just right thickness for year round use. Thickness: 2 5 Machine Wash Cold, Avoid Tumble Dry, as it may cause