The measurement no size chart prints
Instep Fit
A sandal that presses across the top of your foot is not too small — it is too shallow. Measure the height of your instep once, and this page will tell you which of our sandals clear it, which will sit loose, and which will press. All three lists, not just the flattering one.
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How to measure an instep in four steps
It takes a ruler and about a minute. The number is worth more than any size guide, because it is yours rather than an average.
- 01
Stand on a hard floor
Both feet flat, weight evenly on them. Measuring while seated gives a number 3 to 6 mm lower than the one that matters, because the foot has not spread under load.
- 02
Find the highest point of the arch
Run a finger along the top of your foot from the ankle towards the toes. The peak sits roughly a third of the way down from the ankle crease. That peak is what a strap has to clear.
- 03
Hold a ruler vertically against it
The ruler stands on the floor beside your foot, perfectly upright. Read the height at the peak, in millimetres. Do it twice — if the two readings differ by more than 2 mm, do it a third time.
- 04
Use the larger foot
Almost nobody has two identical feet. Measure both and work from the taller instep, because that is the one that will feel a strap first.
Four ways to get it wrong
- Measuring with the foot lifted or seated — the arch is higher when it carries no weight.
- Tilting the ruler to follow the slope of the foot instead of keeping it vertical.
- Reading at the ankle rather than at the arch peak, which adds 10 mm or more.
- Measuring over a sock, which adds 2 to 4 mm depending on thickness.
And while you have the ruler out, measure the length
Stand with your heel against a wall on a sheet of paper, mark the tip of your longest toe — which is not always the big toe — and measure from the wall to the mark. Our size chart is in centimetres for exactly this reason.
Two numbers, and the guessing is over: length picks the size, instep picks the style.
Send us your numbers and we will answer
This tool matches your measurement against the published dimensions of our sandals. It is a geometric comparison and nothing more — it is not medical advice, it does not assess your feet, and it makes no claim about comfort, posture or health. If something about your feet worries you, that is a conversation for a health professional, not a shoe shop.