High breathability socks thanks to their Coolmax® composition.Cuprón®: copper oxide eliminates 99.90% of bacteria and mould that cause foot odour.42% Coolmax, 32% Cupron Polyamide, 12% Cupron Lycra, 8% Elastane, 6% Polyamide.Size S: 2 cm smaller than size M // Size L: 2 cm larger than size M