How to Choose Running Shoes That Fit Right
The wrong running shoe doesn’t always hurt on day one — it tends to show up as a blister, a black toenail, or a nagging ache a few weeks in. A proper fit heads most of that off before it starts.
Shop later in the day
Feet swell slightly over the course of a day, and more so after you’ve been on them for hours. Trying on shoes in the afternoon or evening gives you a more honest sense of how they’ll feel on a run than trying them on first thing in the morning, when your feet are at their smallest.
Leave room at the toe
Your longest toe should sit roughly a thumb’s width from the front of the shoe. That gap matters because your foot slides forward slightly with every stride, especially downhill, and a shoe that fits snugly in the store can crush your toes a mile into a run. If you can’t wiggle your toes at all while standing, size up rather than assuming it’ll stretch.
Bring what you’ll actually run in
Try shoes on with the socks you plan to run in, since sock thickness changes how a shoe fits more than people expect. If you use custom orthotics or inserts, bring those too. Skipping this step is one of the more common reasons a shoe that felt fine in the store feels wrong on the first real run.
Don’t assume your size is the same everywhere
Sizing varies enough between brands, and sometimes between models from the same brand, that your usual number isn’t a reliable shortcut. Most people also have one foot slightly larger than the other, so fit shoes to your larger foot and use an insert on the smaller side if there’s extra room. A specialty running store can watch you walk or jog briefly and point you toward a shoe shape that matches your foot, which is worth doing at least once before buying online from memory.
Fit over feature list
Cushioning levels, drop, and stability features get most of the marketing attention, but none of that matters if the shoe doesn’t fit your foot shape to begin with. If you’re just getting into running, the right warm-up before you head out will do more for how your first few runs feel than a shoe upgrade will. And if a side ache shows up partway through a run, that’s usually unrelated to footwear — our guide on what causes a side stitch during exercise covers what’s going on there instead.
When to replace them
Running shoes lose cushioning and support well before they look worn out, so track mileage rather than appearance if you can. A dull ache in the same spot that appears only when you run is often the shoe telling you before you’d otherwise notice. If a new pair of well-fitted shoes doesn’t clear up recurring pain within a couple of weeks, that’s a better question for a physical therapist or podiatrist than another shoe swap.
The NHS Couch to 5K program has practical starting advice if you’re building up from scratch, including what to look for before your first run.
