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From Fellrnr.com, Running tips
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* {{H:flexibility}}. The Hyper Speed is flexible due to the relatively thin midsole, the groves in the midsole and the breaks in the outsole.
* {{H:outsole}}. The Hyper Speed has a hard rubber outsole that covers nearly all of the contact areas. The midsole covering of the forefoot is in sections to provide flexibility. As you can see from the pictures of the underside of the shoe, the gaps in the outsole are in a zigzag pattern which seems to work well.
* {{H:shape}}. The shape of the Hyper Speed does not match the human foot, and narrows in the toe box. It's not as bad as many lightweight shoes, but I'd recommend [[Shoe Modifications| cutting open the toe box open]] to prevent toe problems.{{H:TryCuttingShoes}}
* {{H:upper}}. The upper is inflexible and mostly seamless with no padding other than the ankle opening.
* {{H:tongue}}. The Hyper Speed has a traditional tongue that is has a tab to attach it to the laces. The tongue is padded at the top and comfortable.
