(Our measurements come from an impact test of a full sole unit, which includes rubber outsoles and layers of glue.)īecause of the foam’s light weight, Nike is able to use more of it, too. The Peg Turbo measured 69 percent energy return in our lab. In tests of running-shoe cushioning systems at the Runner’s World Shoe Lab, we typically see “energy return” (the percentage of energy input that is recovered the rest is generally lost as heat) in the 40 to 60 percent range, with Adidas’s Boost topping the charts near 70 percent. It also delivers greater energy return-Nike reports ZoomX returns 85 percent. Nike says this new foam weighs roughly one-third as much as Cushlon-the midsole material you’ll find in the ordinary Pegasus-yet delivers more cushioning than that shoe. Those properties remain when it’s blown into a foam. Pebax has a lower density than some thermoplastic alternatives (thus, it’s lighter), but is also flexible, resists impact, and returns energy. For example, Mizuno has used it in a Wave plate. The foam is made from Pebax, which is more typically used for plastic bridges and other molded parts in shoes. ZoomX, by comparison, is still highly compressible under your weight (giving you the soft landing), but it rebounds quickly to propel you forward. But typically, feathery EVA midsoles compress easily and are slow to recover their shape. Lightweight foams are nothing new, of course. The key to the Peg Turbo, as noted earlier, is the lightweight foam in the midsole. “You really do feel that extra bounce in your step, and it makes you want to go a little faster.” The Magic of the Midsole “One of the best shoes with special cushioning that I’ve run in,” said another tester. So you’re assured a protective, well-cushioned ride over long runs but will still have bounce to your step so you can motor along more quickly when the mood strikes. It’s also exceptionally soft, especially in the heel. “Much like that shoe, I found myself running 30 to 45 seconds faster per mile on a training run without even realizing it.”īut, the Peg Turbo isn’t just fast. “This shoe is fast-like Reebok FloatRide Run Fast kind of fast,” gushed one tester.

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