04Kit
Knowing when a pair of running shoes is actually finished
A pair of running shoes does not fail on a particular day, which is why the usual advice about distance is close to useless. What follows is what we actually check, in what order, and why keeping two pairs on the go makes the whole question easier.
6 min readWritten 15 September 2025Revised 30 Nov 2025Kaunas
Mileage is a number, not an answer
Every runner eventually hears a figure for how long a pair of shoes lasts, and every runner eventually finds out that the figure belonged to somebody else. Two of us covered near-identical distances last year in similar shoes on the same loops. One pair was finished by spring and the other was still fine in September. Weight, footfall, how much of your running is on sand rather than tarmac, whether you leave them wet in a bag overnight: all of it moves the answer by hundreds of kilometres in either direction.
What a rough total is good for is knowing when to start paying attention. I write the month I started running in a pair on the inside of the tongue with a marker, which takes five seconds and survives a winter, and I begin checking them properly once they have done a season. Before that I do not think about them at all. After that I look at three things, none of which is a number, and any one of the three can retire a pair on its own.
What the midsole tells you
The foam under the heel is the first honest signal. Press a thumb into it either side of the midline, along the outer edge where most people land, and compare what you feel against the other shoe or against a newer pair. A finished midsole has stopped springing back: it dents and stays dented for a beat, and the wrinkles in the foam have gone from fine lines to open creases. That change does not reverse, and no amount of drying them slowly on a radiator will bring any of it back.
You can feel the same thing from above, which is the part people distrust and should not. A shoe near the end feels flat under the heel for the first kilometre, then normal once you are warm, then flat again at the end of a long run. If your calves or the outside of a knee start complaining in the last third of runs that were comfortable a month ago, and nothing else in the week has changed, look at the foam before you start rewriting your training.
Said on the run
- Thumb test along the outer heel, both shoes, against a newer pair
- Fine wrinkles turning into open creases: the foam is done
- Flat at the start, fine when warm, flat again at the end
- New aches in the last third, with nothing else changed
The outsole and the upper
Rubber wears where you land, which on the embankment means the outer heel and the ball of the foot under the big toe. A worn patch on its own retires nothing. The point at which it matters is when the wear breaks through to the foam underneath, because from then on the shoe loses material quickly and, more to the point, grips differently on one side than on the other. On wet wooden steps in November that asymmetry is exactly the thing that puts somebody on the floor.
Uppers fail in two places, and both are quiet about it. The fabric at the outside of the little toe stretches until the foot sits slightly over the edge of the platform, which you notice as an odd feeling on corners long before you notice a hole. The heel lining wears through to a seam that then rubs. Neither makes a shoe unsafe, both make it annoying, and I have kept pairs going for months past the point where they were changing how I ran, because the foam still felt fine.
Two pairs, and where the old ones go
Running two pairs at once is the only piece of kit advice this group hands out unprompted. Alternating them gives foam time to recover between runs, which noticeably extends the life of both, and it means a soaked pair is never the reason somebody skips a Tuesday. It also supplies the comparison that makes every test above possible: a fresher shoe to press a thumb into. When one pair finishes, the newer one becomes the old one, and you never run a whole season on the same tired thing.
Finished running shoes are not finished shoes. Mine become the pair I walk in, then the pair I stop caring about in the garden, and eventually they go into one of the textile bins in town rather than the rubbish. Several people here pass half-worn pairs on to somebody newer who is not yet sure they will keep running, which is a better fate than the back of a cupboard. The only pair I have kept is from the first winter, and it is in a box for no defensible reason.
Said on the run
- Two pairs alternating outlast one pair run twice as often
- Keep the newer pair as your reference for the thumb test
- Write the starting month inside the tongue with a marker
- Textile bins or pass them on; a cupboard helps nobody