You order the same size they wear in sneakers. The box arrives. The shoes are enormous, or they don't go on at all. You start a return.
This happens constantly, and it isn't your fault. Kids' sizing is not standardised. A US 8 from one brand can be a full centimetre different from a US 8 from another, because each manufacturer works from its own last — the foot-shaped mould a shoe is built around. There is no governing body enforcing consistency. The number on the box is closer to a suggestion than a measurement.
The fix is to stop working in sizes and start working in centimetres. It takes half a minute and a sheet of paper.
The 30-second method
You need a piece of paper, a pen, a ruler or tape measure, and a wall.
One. Put the paper flat on a hard floor with one edge pushed against the wall. Carpet will give you a false reading — the paper shifts and the foot sinks.
Two. Stand your child on the paper with their heel touching the wall. Standing matters. A foot spreads under body weight, and a measurement taken sitting down will come out several millimetres short.
Three. Mark the paper at the tip of the longest toe. This is not always the big toe. Roughly one child in five has a second toe that's longer, and if you measure to the big toe on those feet you will end up ordering short.
Four. Move them off the paper and measure from the wall edge to your mark, in centimetres.
Five. Do the other foot. Most people have one foot slightly larger than the other. Order for the larger one.
What to do with the number
| STEPGLO size | Foot length | Inches | EU |
|---|---|---|---|
| US 7 | 14.5 cm | 5.7" | EU 23–24 |
| US 8.5 | 15.5 cm | 6.1" | EU 25–26 |
| US 10 | 16.5 cm | 6.5" | EU 27–28 |
Match your measurement to the foot length column, not to the size your child wears in another brand.
If you land between two sizes, go up. There's room in the toe box, and kids grow into things faster than anyone budgets for. A slide that's a few millimetres long still stays on. A slide that's a few millimetres short is unwearable from day one.
That advice reverses for closed shoes, incidentally. In sneakers, too much length causes tripping. In an open-back slide, the failure mode is the shoe coming off, and a slightly generous fit doesn't cause it — a badly proportioned one does.
Why the measurement drifts
Feet aren't fixed. Three things move the number, and it's worth knowing which.
Time of day. Feet are measurably larger in the evening after a day of walking. If you measure first thing in the morning, you're measuring the smallest version of that foot. Late afternoon is the honest reading.
Heat. Feet swell in summer. Since these are summer shoes, that's the condition that matters — another argument for sizing up rather than down.
Growth. Under-threes can add a full size in three to four months. Between three and six it slows to roughly a size every five to six months. If you're buying at the start of a season, measure with that in mind.
The practical version: measure in the afternoon, in the season you're buying for, and round up.
Common mistakes
Measuring over thick socks. Fine for winter boots, misleading for slides, which are worn barefoot. Measure the bare foot.
Trusting the insole trick. Pulling out the insole of an existing shoe and measuring it gives you the shoe's internal length, not the foot's. Those differ by whatever wiggle room that particular brand builds in.
Converting from EU or UK sizes. Every conversion chart online disagrees with the others, because they're all converting between two systems that aren't standardised in the first place. Go back to centimetres.
Buying two sizes up "to last". In a slide, this is the single most common cause of a shoe that comes off and a child who trips. Half a size of headroom is the sensible ceiling.
When to measure again
Every three months for under-threes, every four to six months after that. It takes thirty seconds and it saves a return every time.
A quicker check in between: press your thumb at the very front of the shoe with your child standing in it. If there's no gap at all in front of the longest toe, you're already too late.
Questions parents ask
Should I measure both feet?
Yes. One is usually slightly larger. Order for the larger foot.
My child's second toe is longer than the big toe. Which one do I measure to?
The longest one, whichever it is. Measuring to the big toe on those feet gives you a shoe that's too short.
Can I just use their sneaker size?
It's the most common reason returns happen. Sneaker sizing varies by more than a centimetre between brands, and a slide is less forgiving than a closed shoe because there's no heel counter holding the foot in place.
How much growing room should I leave?
Half a size at most. Beyond that, an open-back shoe starts slipping off.
STEPGLO slides come in three sizes — US 7, 8.5 and 10 — mapped to foot length in centimetres rather than to any brand's sneaker sizing. If the size turns out wrong, you have 30 days to send them back.