Regia Premium Bamboo sock yarn. REGIA PREMIUM BAMBOO quality consists of 30 % bamboo viscose. The addition of bamboo gives the yarn an extra-soft hand and an elegant shimmer. Good breathability and a pleasurable foot climate for optimal wearing comfort. Enjoy how it feels on your skin: soft, supple and relaxing, step by step. Like all REGIA yarns, it won’t felt and offers long-lasting wear and great shape retention. REGIA BAMBOO is machine washable up to 40° C (100° F) and can be knitted like REGIA 4-ply.