Compare
the lab.
Stack any two to four running shoes side by side — weight, drop, foam, plate and price, measured. No spin.
Pick two to four shoes and we'll line them up.
Build a shoe.
Find it.
Drag the stack heights and the shoe redraws — foam, plate, outsole and upper, each its own colour. Drop is what falls out of the two, not something you set. When it looks right, see which real shoes you just described.
- Upper
- Heel counter
- Midsole foam
- Plate
- Outsole
- Your foot & load path
Side view, drawn to scale from the numbers you set. The foot inside it is drawn to the same scale — change Foot strike and watch how the platform meets the ground. Heel and forefoot stack are the two figures that decide how a shoe sits under you.
Legal for road and track
Specs get you close. Trying them on decides it — these link through to our Shoe Lab partner.
New here? What stack height and drop actually mean
Stack height
The foam between your foot and the road, quoted at the heel. More of it means more to absorb the landing and less road coming back — protection you feel most late in a long run, paid for in ground feel and a little stability. Under about 20 mm you feel everything. Over 35 mm you are running on a cushion.
Heel-to-toe drop
Heel stack minus forefoot stack — the wedge, not the height. Drop moves load rather than removing it: more of it shifts work off the achilles and calf and towards the knee, less of it does the reverse. It is why two shoes with the same stack can feel nothing alike, and why changing it wants weeks rather than runs.
The 40 mm rule
World Athletics caps road racing shoes at 40 mm of stack, and track events from 800 m up at 25 mm. Past those a shoe is still a shoe — just not one you can set a ranked time in. Build past 40 mm here and the diagram says so.
The Shoe Lab is built with iRUN Singapore, whose specialists fit runners day in, day out. The specs here are compiled with them — and the shoes are in their stores if you want to put a pair on before you decide.
Find a storeEvery shoe,
by brand.
The full spec table for each brand, split by what the shoes are built for.
By brand
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