J.B. Expedition Technical Walker Coolmax Double Padded Sole Socks (2 Pairs) 15% nylon Content: 55% Coolmax, 23% Acrylic, 15% Nylon, 7% Lycra Spandex Coolmax- DuPont's unique four channel fiber for a total moisture management Extra thick cushion for amazing comfort! Arch Support- Ensures snug fit prevents bunching Compare with THORLO @ $13 A PAIR!