Why labels are not enough
A US 9 from one batch can measure 27.0 cm and a US 9 from another can measure 27.8 cm. The label is a marketing convention; the last is a physical object. When you compare across sellers, compare the last.
The only reliable method is a flat insole measurement: take the insole out of a pair you own, measure heel to toe in centimetres, and ask the seller for the same measurement on the pair you are buying.
Three questions that settle most sizing
Ask for the insole length in centimetres, the width at the widest point, and whether the seller recommends going up for a wide foot. Those three answers cover most of the uncertainty.
For high-tops, ask whether the collar padding compresses. A padded collar can make a half-size difference in how the shoe sits around the ankle.
| Your measured insole | Typical ask | Watch out for |
|---|---|---|
| 24.5–25.0 cm | EU 39–40 | Narrow lasts in leather sneakers |
| 25.5–26.0 cm | EU 41 | Batch variance of ±0.5 cm |
| 26.5–27.0 cm | EU 42–43 | High-top collar padding |
| 27.5–28.0 cm | EU 44 | Chunky soles adding internal volume |
Socks, insoles and the half-size fix
If a pair arrives half a size large, a thicker insole is usually a better fix than a thick sock. If it arrives half a size small, a thin insole and a shoe stretcher can buy a few millimetres — but never assume it will.
Order the measurement before the pair, not after. A seller who cannot measure an insole is a seller who has not handled the shoe.
Quick answers
Should I size up in chunky sneakers?
Usually not for length, but the internal volume changes how the shoe feels. Ask for the insole width as well.
Do high-tops fit differently?
The collar padding can make them feel tighter around the ankle even when the length is right.
Can I trust a size chart image?
Only if it matches the seller's actual last. Ask for a measured insole instead.
Put the guide to work
Open a seller profile, pick a category, then compare real catalog photos with the checks you just read.
Open Yupoo