These socks are anything but prickly. In fact, our entire Bamboo collection is renowned for being oh-so-soft.They're also approved by the FSC® for being sourced from responsibly-managed forests. Accredited by the Forest Stewardship Council® for being sourced from responsibly managed forests Certified by OEKO-TEX® Standard 100 for zero harmful substances present Made using rayon from bamboo for a super-soft sock Seamless toe which limits irritation or chafing Blended with nylon for durability and spandex for flexibility Moisture wicking and great for sweaty feet Kind to sensitive skin Machine wash cold. Do not bleach. Tumble dry low or hang to dry. 62% Rayon From Bamboo, 36% Nylon, 2% Spandex S/M 9-11 (Women's Shoe Size 6-10.5 and Men's Shoe Size 5-9)