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From Fellrnr.com, Running tips
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* {{H:flexibility}}. The One<sup>2</sup> is a remarkably flexible for shoe due to the deep grooves in the bottom of the midsole, and the shallow grooves in the top.
* {{H:outsole}}. There is almost no outsole, just a couple of tiny patches of the extreme front and rear of the shoe. The bulk of the bottom of the shoe is exposed foam, which is part of the reason the shoe is so light as the harder rubber used on many shoes is quite heavy. However, this does dramatically reduce the wear characteristics, and '''I got only a little over 200 miles''' from mine before they needed retirement.
* {{H:shape}}. The shoe is the classic Altra shape, which follows the outline of the human foot much better than other makes. It has a broad toe box, but I find there is not enough height for my toes and [[Shoe Modifications| I still have to cut the toe box open]].{{H:TryCuttingShoes}}
* {{H:upper}}. The upper is reasonably thin, but more substantial than you would expect from a shoe this light. It has excellent padding around the ankle opening.
* {{H:tongue}}. The One<sup>2</sup> has a classic tongue, but it's partially attached on one side to keep it positioned, which I like a lot. It has minimal but adequate padding.
