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78% Hydrotec Polyester, 20% Nylon, 2% Spandex
The Fitsok CF2 Low Cut Cushion Socks are great socks, love them.
I highly recommend these socks. I have been wearing them for 7 years and have run 3 marathons and 10 half-marathons--and all my practice runs in them and have NEVER gotten a blister. They fit well and are long lasting! I can't believe no one else has written a review of them!