87% Viscose from Bamboo, 10% Nylon and 3% Spandex.
Designed in California, made in China.
Small/Medium = Men's Shoe Size 5-9 Women's 6-10.
Large/XLarge = Men's Shoe Size 10-14 Women's 11-13+ET-SL |$10.50 per pair.
Overall, very comfortable. They seem to be cooler than my usual socks and my feet don't seem to have any athletic odors after exercise, etc. after using them.