PWRRUN: four foams under one name

The four foams

Saucony names the chemistry of each one on its own technology pages, which is more than most brands will tell you. Set side by side, the family looks like this:

The gap between the ends of that table is not a matter of degree. An EVA blend and a beaded PEBA are as different as two midsoles get: in weight, in how much of the step comes back, in what they cost and in how long they last.

What Saucony publishes, and what it does not

Credit where it is due. Saucony says in plain words what each foam is made of – EVA, TPU, PEBA – and names the process, down to the steam. On publishes nothing of the kind about its pods, and New Balance’s announcements for Fresh Foam X never say what the foam is. Among midsole makers that is a good disclosure record.

What is missing is a single number. Across Saucony’s own foam pages there is no energy-return figure, no weight saving, no durability measure: the claims are “exceptional energy return”, “fantastically light weight”, “exceptionally durable over long distances”. Percentages for these foams do circulate on review and retail sites. None of them comes from Saucony, and a figure nobody will stand behind is not worth carrying into a buying decision.

The name is also no longer the whole range. Saucony’s newest flagship foams have arrived under different badges – a supercritical A-TPU and a TPEE blend, neither of them called PWRRUN – so a shoe without the word on it is not necessarily the lesser shoe. The family name tells you less each year.

Two foams in one midsole

The Endorphin Pro 4 is the clearest case of why the suffix matters: it uses two of these foams at once. PWRRUN HG goes directly under the foot, PWRRUN PB makes up the bulk of the midsole beneath it, and a carbon plate sits between them. Saucony calls the pairing an industry first, and the logic is straightforward – the firmer, springier foam where the foot presses hardest, the lighter one for the volume underneath.

It works, and it is the reason that shoe behaves more civilly at slow paces than most plated racers. It also means the word PWRRUN on that one box is describing two different materials at the same time.

The cost of a race foam is the usual one. Light is not durable: on that same shoe the upper is thin and the outsole is barely two millimetres of rubber, and a pair kept for everyday miles will be finished long before an everyday trainer bought on the same day.

Which one you actually want

For daily miles, plain PWRRUN or PWRRUN+. The EVA blend is predictable and cheap to replace; the TPU version is softer, keeps its bounce longer and is the better buy if you run most days. Neither will feel fast, and neither is trying to.

For sessions and for racing, PB or HG. This is where the money goes and where it is justified: a beaded PEBA returns noticeably more of the step than anything EVA-based, and at speed you can feel it. Buy it for the days it is for.

The trap is paying race-foam prices for everyday running. A PEBA midsole used for the daily hour will go flat while the cheaper shoe beside it is still fine – and because the family has grown and been renamed more than once, the safest habit is to read the suffix on the shoe in front of you rather than remember what the line carried two years ago.

Where you’ll find it

Shoes on this site built on one of the foams. They are examples of what the family does in practice, not a catalogue.

See it in the full table, where you can filter by activity, material and price.

Similar and competing technologies

Every brand has the same four or five materials to choose from and its own set of names for them. What follows is the same table from the other side: the materials, and who else uses them.

All four of the PWRRUN foams are the midsole itself rather than something added to it. How a company that spent its first seventy years making children’s shoes in Kutztown ended up building race shoes is told in the story of Saucony.