The "WOOL" socks, which are made of two layers of silk on the inside and New Zealand Merino wool on the outside, are now available in four new colors: black, vivid pink, and two colors: red mist and blue depth! The combination of silk and wool makes them very soft and comfortable to wear even when layered. Recommended for cold days when your feet are freezing. One size fits all for both men and women. Please see the product page for details.