PWRRUN PB Explained
In brief: PWRRUN PB is Saucony's premiere PEBA-based super foam, built from expanded Pebax beads, the same base polymer found in Nike ZoomX. Independent testing measures around 88 percent energy return, and it weighs roughly half as much as traditional EVA at equivalent volume. Temperature stable and consistent across conditions, PWRRUN PB powers Saucony's performance lineup from fast training to race day.
What is PWRRUN PB?
PWRRUN PB is Saucony's premiere super foam, built from expanded Pebax beads. PB stands for the peak-performance bead construction at the heart of it. Pebax is a lightweight, highly resilient polymer in the PEBA family, the same base material used in Nike's ZoomX foam, and expanding it into beads creates a midsole that is exceptionally light and energetic. PWRRUN PB sits near the top of Saucony's foam range, the compound chosen when a shoe needs to feel fast, bouncy, and efficient. It is the foam that brought genuine super-foam performance to Saucony's lineup and remains central to their fastest training and racing shoes.
The numbers behind it
PWRRUN PB earns its place with measured performance, not just marketing. Independent testing puts its energy return at around 88 percent, with RunRepeat measuring a forefoot rebound of 78.2 percent, figures that place it firmly in super-foam territory. Just as important is weight: PWRRUN PB weighs roughly half as much as traditional EVA at equivalent volume. That lets designers build tall, cushioned stack heights without the shoe becoming heavy, so runners get plenty of protective foam underfoot while keeping the shoe light and quick. High energy return plus low weight is the formula that defines modern performance running, and PWRRUN PB delivers both.
Why expanded Pebax matters
Expanding Pebax into beads, then fusing those beads into a midsole, gives PWRRUN PB its distinctive springy, lively feel. Each bead acts like a tiny spring, compressing under load and snapping back to return energy to the runner. Because the base polymer is so light and resilient, the foam can be soft and protective without going flat or feeling sluggish. PWRRUN PB is also temperature stable, performing consistently whether you are racing on a cold morning or training in summer heat. That reliability across conditions is a meaningful advantage over EVA, which changes feel with the weather.
Where you will find it
PWRRUN PB spans Saucony's performance range, from fast daily trainers to race-day shoes. It features in models such as the Endorphin Speed 5, the Triumph 23, and the Tempus 2, each using the foam differently. In the Endorphin Speed it provides the responsive bounce that pairs with a nylon plate for tempo work and racing; in the Triumph it brings plush, energetic cushioning to a premium daily trainer; and in the Tempus it combines with firmer foam in a stability-minded design. That versatility is a sign of how good the foam is: light and energetic enough for racing, durable and comfortable enough for everyday miles.
How it compares within Saucony's range
PWRRUN PB sits above the EVA-blend PWRRUN and the TPU-based PWRRUN+ in terms of energy return and lightness, making it the go-to foam for performance. Compared with PWRRUN HG, the two are both premium PEBA foams, but they are tuned differently: PWRRUN PB leans towards a softer, livelier, more versatile feel suited to a wide range of fast shoes, while PWRRUN HG is firmer and more race-focused. For most runners chasing speed who still want everyday usability, PWRRUN PB is the standout choice across Saucony's range.
PWRRUN PB at OD's Designer Clothing
At OD's Designer Clothing we stock Saucony performance shoes powered by PWRRUN PB, including models from the Endorphin Speed, Triumph, and Tempus families, covering fast training and race-day running. Our footwear team can help you match the right PWRRUN PB shoe to your pace and goals, whether you want a plush daily cruiser or a lively tempo trainer. We offer next-day delivery and free click and collect, and you are welcome to visit our St Helens store to try them on, feel the bounce of the super foam underfoot, and get fitted before you buy.