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77% Nylon, 19% Olefin, 4% Lycra Spandex
Certainly as comfortable a pair of socks as any I've ever worn. It's early on in terms of my owning them, so I'll have to see just how durable they shall turn out to be. Modern day socks seem to have gravitated towards a predetermined foot, by the way they've been manufactured. Hence the L and R on each of these Swiftwick socks. These however simply have L's on both (signifying their size I believe) While I won't be so stupid as to try and put both on my left foot, I'll have to keep my eye one the shape they take from wearing them to help me make the proper decision as to which is which.