Pebax / PEBA Foam Explained

In brief: Pebax is Arkema's trade name for polyether block amide (PEBA), the thermoplastic elastomer foam that revolutionised running footwear. Nike's Vaporfly first commercialised it as ZoomX in 2017, creating the super shoe category. PEBA returns around 80 to 85 per cent of energy, beating TPU and EVA, while weighing 20 to 30 per cent less than TPU at equivalent stack height, and a bio-based version, Pebax Rnew, is derived from castor beans.

What is Pebax and PEBA foam?

Pebax is Arkema's trade name for polyether block amide, usually shortened to PEBA, the thermoplastic elastomer foam that revolutionised running footwear. PEBA is the material; Pebax is the best-known brand of it. Its arrival changed the sport: Nike's Vaporfly first commercialised PEBA as ZoomX in 2017, and in doing so established the super shoe category that has reshaped distance running ever since. What made it so transformative is a rare combination of properties, returning energy far more efficiently than older foams while weighing significantly less. For runners chasing pace, PEBA became the foam to have, and it now appears across premium models from many brands.

Why PEBA returns more energy

The headline figure for PEBA is its energy return, reported by Arkema at around 80 to 85 per cent. That compares with roughly 70 to 75 per cent for TPU and 60 to 65 per cent for EVA, the foams that came before it. In practical terms, more of the energy you put into each footstrike is given back to you rather than lost, which can make running feel easier at the same pace. The foam compresses and rebounds with unusual efficiency, behaving almost like a spring underfoot. This is the core reason super shoes feel so lively, and why PEBA sits at the top of the foam hierarchy for performance.

Weight, running economy and carbon plates

PEBA's advantages go beyond rebound. It is also light, around 20 to 30 per cent lighter than TPU at an equivalent stack height, which lets brands build tall, cushioned midsoles without the usual weight penalty. When PEBA is paired with a carbon plate, the combination has been shown to improve running economy by roughly 4 to 6 per cent, meaning runners use less energy to hold a given pace. That is the recipe behind the modern super shoe: a thick slab of responsive PEBA foam with a stiff plate to channel its energy. Together they translate into faster times for the same effort, which is why elite racers rely on them.

Is PEBA worth the premium?

For serious runners, PEBA usually earns its higher price. The measurable improvement in running economy translates to faster times at the same effort, a genuine advantage on race day or in key training sessions. The trade-offs are cost and, potentially, a shorter midsole lifespan under heavy daily use, since the very softness that makes PEBA so responsive can also break down faster when hammered every day. For that reason PEBA shines best as a race-day or key-session foam rather than an everyday trainer. There is also a bio-based option, Pebax Rnew, derived from castor beans, for those who want the performance with a lower-impact origin.

Temperature stability and which shoes use it

PEBA holds another practical edge: temperature stability. Where EVA can harden noticeably in the cold, PEBA maintains consistent performance across conditions, so the shoe rides the same on a frosty morning as it does in summer. You will find PEBA-based foams in many of today's top performance shoes, including Saucony's PWRRUN HG and PWRRUN PB and On Running's Helion HF. These are the kind of premium models built for speed, where the foam's energy return and light weight justify its place. If you are shopping at the performance end of the range, PEBA is the technology powering most of the standout options.

Pebax / PEBA Foam at OD's Designer Clothing

PEBA-based foams feature in the Saucony Endorphin series and On Running performance models that form part of our running range at OD's Designer Clothing. We stock these alongside other leading performance brands, and our team can explain how PEBA's energy return and light weight stack up against TPU and EVA so you can decide whether the premium suits your running. Order online with next-day delivery and free click and collect, or visit our St Helens store to try the latest super shoes on and feel the foam behind them. Ask us which PEBA model fits your race-day or training goals.