51% Thermovyl, 49% Wool, Chlorofibre. These socks will protect you by preventing the spread of slime if you come into contact with it. Flammability test in accordance with EN ISO 14116: 2015. Odour-free, tested to NF EN 14362-1. Anti-Bacterial, antibacterial efficacy test carried out by Centexbel N° 6047