New colors, deep green and dusty rose, have been added to the petta five-toe socks, the thinnest and lightest in comfort. The petta socks are knitted with a two-layer structure: the inner layer, which touches the skin, is 100% silk, and the outer layer is 100% cotton. The stretch yarn (the inner thread that gives socks their unique stretch) is placed on the outside, allowing the entire surface of the socks to touch the skin. The medium size socks are available in these two colors. The large size socks are available in six colors. Please see the product page for details.