These socks use Rototo's classic wide-ribbed design, knit with slubby yarns dyed to an indigo-like hue with traditional "naka-shiro-zome" dyeing methods, which is normally used for denim yarns, leaving the cores white so that the fabric can age naturally with wear. These are not actually indigo-dyed, and shouldn't cause very much colour transfer. 

• R1645 Organic Cotton Indigo Socks
• 88% cotton 9% nylon 2% polyester 1% polyurethane
• "Naka-shiro-zome" dyed slub yarns
• Chunky wide ribbed knit fabric
• Comfortable, durable material
• Crew length socks
• Padded toes & heels
• Ribbed cuffs
• Made in Japan