Bridgedale Men's CoolFusion Run Speed Demon Socks 55% nylon Importado ENDUROFIL is a thermal yarn and is combined with Enduro-Wool and Merino Wool for superb wicking and durability. ENDUROFIL is a polypropylene fibre and offers high abrasion and wash resistance T2 ANTI-SHOCK CUSHIONING. A loop within a loop that offers an additional level of impact protection resulting in all day long comfort. Advanced zonal padding system that provides extra support and comfort to areas of the foot and leg LYCRA fibre is an elastic fibre that ensures Bridgedale socks fit and stay fitted. LYCRA is knit in specific zones to further improve fit and long term comfort and helps Bridgedale socks keep their shape year after year ULTRA LIGHT WEIGHT and ankle height with impact padding and protection IMPORTED 55% Nylon, 23% Endurofil, 20% Merino Wool, 2% LYCRA