Womens Premium Non Slip Bamboo Hidden Shoe Liner Sock 67% Bamboo fabric / 30% cotton / 3% spandex Super Soft and comfortable. Wicks Moisture. Non-skid Silicone inside heel Tumble dry medium polyester blend fleece Machine Wash Warm. Do not Bleach Size 09 - 11 (Shoe Size: 6 -9 US)