compression socks' material are upgraded with nylon percentage from 40% to 85%, Delivers 360-degree stretch for greater flexibility and durability.breathable high performance fabric keeps an optimal temperature. Bacteria and moisture for maximum cotton level of comfort. They do not make your feet sweet
Apparently the material is part of the trade secret, but from wearing them, I would bet they are nylon and latex in the mix. These are the best socks I ever had, get the right size and you feel great wearing them.