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66% Nylon, 17% Polyester, 14% Olefin, 3% Lycra
Another great Swiftwick sock. I bought these for running and so far have several runs and one 13 mile run in these. Snug Swiftwick signature fit. Medium cushion. The five inch cuff gives some ankle support. If I have any negative thoughts it would only be that I think a 4 inch cuff is a better height and more color options.