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From Fellrnr.com, Running tips
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* {{H:flexibility}}. The bionic is remarkably flexible, as it has holes in the midsole, as well as grooves. One issue is that stones can get into the holes, causing pain.
* {{H:outsole}}. There is almost no outsole, with some small patches under the big toe and midfoot area. The bionic is one of the few shoes I've come across that has the additional abrasion resistance under the midfoot rather than the heel. Most of the bottom of the shoe is exposed foam, which reduces weight at the expense of longevity, but the bionic seemed to have much better where resistance than other shoes I've come across.
* {{H:shape}}. The Bionic has the classic running shoe shape that does not match the human foot, but the toe box is not as bad as many shoes. Nonetheless I still found that I had to [[Shoe Modifications| cut the toe box open]].{{H:TryCuttingShoes}}
* {{H:upper}}. The upper is a little thicker than many shoes. The material from the midfoot to the back of the shoe is slightly cushioned and completely inflexible. However, the area from the forefoot forward is nicely flexible and breathable. The padding around the ankle opening is a little less than I would like, but adequate nonetheless.
* {{H:tongue}}. The Bionic has a classic tongue that is attached half way along its length to either side of the shoe, making it nicely stable. The tongue is made of soft almost neoprene material that works quite well.
