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* {{H:cushioning}}. The Boost is well cushioned, and the cushioning has far more spring than conventional EVA foam. There is some evidence that this improves [[Running Economy]].
* {{H:drop}}. With that the insole removed, the Boost has 7 mm of drop, which is more than I'd like.
* {{H:structure}}. This shoe uses single density of foam, with no grooves to improve flexibility. * {{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 Dissection| cutting open the toe box for comfort]] is a good idea.