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 isnomer; it’s more like “less energy lost.” An 
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Сообщение isnomer; it’s more like “less energy lost.” An
Pebax is a brand-name play Nike Air Max 97 Femme on the generic name: polyether block amide (PEBA). Like TPU, it’s what’s called Nike Air Max 95 Dámské a block copolymer, a Nike Air Max 2017 Femme definition that’s essential to its advantages. To go back to Rancourt’s Lego analogy, Pebax is also made of blocks. But instead of being randomly arranged, Arkema can actually join chains of blocks of Nike Air Max 97 Damen a single color, and vary the length of those chains, alternating hard and soft sections precisely to control the amount of cushioning and rebound.Shoemakers have for years tried to find alternatives, all the way back to Nike’s original Air Tailwind and its air cavity in 1978. I suspect most runners have Nike Air Max 720 Womens no idea Nike Air Max 270 Mujer what we’re talking about,” says Saucony’s White. “The majority just want a good shoe that feels great.”

So as a product, Pebax isn’t one specific thing, says Kevin Hanrahan, chief marketing officer for Arkema’s technical Nike Air Zoom Spiridon Womens polymers unit. “It’s a range from very rigid to very soft, and you can get the Adidas Superstar Dam energy-return properties of a polyether Nike Air Odyssey Damen Herren without compromising softness.” That’s also technically the case for TPU or any other block copolymer, says Rancourt. But there are certain advantages to some over others. Weight, for Adidas ZX Flux Dámské instance: Arkema says Pebax is as much as 20 percent lighter than TPU-based foams like Boost. TPU, in turn, has the advantage of long life, since it has a lower compression set than Pebax or EVA. And both TPU and Pebax offer consistent performance in a wide temperature range. But maybe the signature advantage Nike Air Max 95 Dam among these foams Nike Air Max 270 Dam is Pebax’s rebound, or energy return.

“Energy return” is a bit of a misnomer; it’s more like “less energy lost.” Any foam midsole, when compressed under load, will store a certain amount of energy on a footstrike Nike Air Max 90 Dam that rebounds back when the runner pushes off. Shoes with midsoles based on EVA foams have a range of energy return depending on how they’re formulated, but generally, they top out around 65 to 70 percent. TPUs like Boost are better, at 70 to 76 percent. But the two best shoes Runner’s World has ever Nike Air Max 90 Damen Adidas ZX Flux Dam tested in terms of energy return are the Vaporfly 4% and 4% Flyknit, which offer as much as 82 percent return in deflection and rebound testing. (Kram and Hoogkamer measure it even higher, at 87 percent.)


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