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3.5/5 4/5.5 4.5/6 5/6.5 5.5/7 6/7.5 6.5/8 7/8.5 7.5/9 8/9.5 8.5/10 9/10.5 9.5/11 10/11.5 10.5/12 11/12.5 11.5/13 12/13.5 12.5/14 13/14.5 14/15.5 15/16.5

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Designed for distance runs. Lightweight, breathable, flexible...and crazy-fast.