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From Fellrnr.com, Running tips
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* {{H:flexibility}}. The Boost is less flexible that I would have expected, partly because the foam does not have any grooves, and partly because of the extensive outsole.
* {{H:outsole}}. There is a hard rubber covering most of the contact area of the shoe, which improves longevity.
* {{H:shape}}. The shoe is does not match the shape of the human foot, so [[Shoe Modifications| cutting open the toe box for comfort]] is a good idea.{{H:TryCuttingShoes}}
* {{H:upper}}. The upper is inflexible and fairly thick, with poor breathability compared with most shoes. There is a plastic 'skeleton' over the shoe from the ball of the foot back which adds weight and reduces comfort without seeming to add much value. However, it never caused me any discomfort.
* {{H:tongue}}. The Boost has a tongue that is partially attached to either side of the upper. I found that this worked well, as it felt like a conventional tongue that stayed in place perfectly. The tongue has thick, soft padding.
