These qualities make the Streakfly great for speed training for up to a 10K distance.

It’s somewhat similar to the New Balance Fuelcell Rebel 2, except for the Swoosh logo on the upper and lower midsole stack. The 6-ounce weight makes the shoe invisible from a sensory standpoint, and the secure upper breathes extremely well. The Nike ZoomX Streakfly weighs less than 7 ounces for a half pair of US 11, and 6 ounces for the sample size. On a related note, the Streakfly has parallels with the 2014 Nike Lunarlaunch – perhaps the only Nike running shoe ever made with a 100% Lunarlon midsole. The Nike Lunarlon foam only formed the midsole core the outer casing was made of a firm EVA-based material.īut what if a racing shoe midsole was made of nothing but ZoomX foam? Be careful what you wish for. If you’re not using a rim or a grippy outsole, then use a firmer layer of foam under the PEBA midsole.Ī relevant Nike example of blending soft and firm midsole materials was the Lunaracer.

Use a firmer EVA rim on top of the PEBA midsole, and use an outsole with reliable traction – like the Reebok Run Fast 3.ģ. The soft midsole added the necessary ride comfort for short-distance races, whereas the low stack height and DSP outsole made the shoe ‘fast’.Ģ. The Reebok Run Fast Pro was an excellent example of this design best practice.

Keep the stack height very low, and use an ultra-grippy forefoot outsole. Why? Because there’s a glut of carbon-plated cushioned racers, and you want to differentiate your fledgling brand.Īnd if this hypothetical road racer were to use PEBA foam (short for Poly-Ether-Block-Amide) in its midsole, there are three different ways to go about it.ġ. Let’s assume, for the sake of this review, that you want to start a new running shoe company that only sells low-profile racing flats. Designing a competent road racer for short runs involves more than just a PEBA foam midsole.

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