Machine wash. 5 pairs socks contains. We stand by our products 100% and will immediately replace any products found to be defective. Simply email us with any complaints/comments. More soft and comfortable than normol dress socks.Classic dress socks are perfect for the office, travel or casual wear; Thicker and durable; Suits for all season. Non-binding loose fitting stay-up top and wont restrict circulation. Socks will not fall down. They will remain secure during any workout. Seamless toe eliminates bulky toe seam ,reduce the risk of infection, foot pressure, blistering; The micromesh weave allows these socks to breath and wick away sweat perfectly. These socks come in a ankle length with lace top ruffle frilly socks; Sock Size:9-11(Fits women's shoe size:5-10). Machine Wash. 80% bamboo blend combed cotton + 20% elastane, soft material for the finest fit; Bamboo fiber provides:Antibiosis/Absorbent/Deodorization,Keep your feet health fresh and dry;Environmental and healthy.