For years marathoners have been asking Nike for a shoe that feels like a sock, and now it's a reality with the FlyKnit. Runner Abdi Abdirahman, who placed third in the US Marathon trials in January, wore FlyKnits during the race and said he kept looking at his feet to make sure he still had shoes on. Lightweight and fitted, a size nine men's FlyKnit weighs 5.6 ounces. To put that in perspective, the average iPhone weighs 4.9 ounces.
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