Shoe sizes 4-9. Soft & breathable. Ventilated. Bamboo fibers for complete moisture control. Made in USA of domestic & imported yarn. Directions: Machine wash warm with like colors. Only non-chlorine bleach when needed. Tumble dry medium. Ingredients: White & Black: Cotton (71%), Nylon (19%), Rayon from Bamboo (8%), Polyester (1%), Spandex (1%).