Pack of 4 pairs of eco-conscious no-show socks. Silicone insert at the heel 70% bamboo rayon, 23% polyester, 2% spandex Size 5-9These socks were made with bamboo rayon: a better for the planet fabric. Bamboo is one of the fastest growing plants in the world, and grows without the use of pesticides, making it a sustainable raw material. Naturally antibacterial. | Ardene 4-Pack Bamboo Rayon Shoe Liners in Grey | Polyester/Rayon/Spandex | Eco-Conscious