Sizing Guide

Most shoe brands base their sizes on an average foot and make minor adjustments they call "wide." That doesn't work and we know because the data proves it.

Here’s why. Every shoe is built around a last, or a foot-shaped form the factory shapes the shoe around. It decides the fit before a single piece of leather is cut. Add width to a last that was built around an average foot and you get a roomier version of the wrong shape: more room, but not where your foot actually needs it.

So we started from the width and length together, not length alone. We analyzed 1.2 million real female foot scans and had our lasts built around the result, rather than scaling width after the fact.

Every size we make fits a foot more than a centimeter wider than average for its length.

  • Built from 1.2 million real foot scans, not outdated size charts

  • Width increases proportionally with length and it’s measured, not assumed

  • More than a centimeter wider than the average foot, at every size

  • No squeezing, no breaking-in, no sizing up for width

We currently make sizes 35–43, fitting feet up to 27.4 cm with more sizes in the works. If we can’t fit you yet, we’re building toward you.

Our sizing is based on length and width. We use EU-style numbers as labels, but they aren't a conversion — our 38 isn't the 38 you wear elsewhere. We don't publish US sizes because they vary so drastically between brands, and our own fit testers reported wearing about half a US size above the standard conversion, which is exactly what sizing up for width does to your usual number.

Measure both feet and use the longer one. Check it against the finder here. Keep in mind your usual size won’t tell us what we need to know.

Size Chart

IN CM
Martina Size Fits foot length up to Fits foot width up to
35 22.1 9.7
36 22.8 9.9
37 23.5 10.0
38 24.0 10.5
39 24.7 10.7
40 25.5 11.5
41 26.1 11.7
42 26.8 12.0
43 27.4 12.2

No need to size up here! Take the smallest size your measurement fits under. Every size fits a foot more than a centimeter wider than average for its length. We measured against 1.2 million real foot scans, not a standard size chart.

Sizes 35, 36, 41, 42 and 43 are pre-order and ship in March 2027.

Sizing FAQs

  • Use our Fit Guide to find your best size based on both foot length and foot width. Unlike most brands, we provide sizing guidance that goes beyond length alone.

    If you’re between sizes, we generally recommend sizing based on length first, as our shoes already provide the width most women need.

    Still unsure? Reach out — we’re happy to help.

  • You likely won’t need to anymore. Our shoes are already designed to accommodate wider feet, so many customers find they can finally wear their true length without discomfort.

  • US sizing isn't standardized—a size 8 varies wildly between brands. EU sizing based on centimeters is more accurate and consistent.

  • Most brands call a shoe "wide" when it's only 3–5 mm wider than standard.

    Our shoes are built from the ground up using custom lasts based on real foot-scan data from millions of women.

    Our widths align with the 75th percentile of width and are 8-12mm wider, meaning they fit the women who are most commonly underserved by traditional footwear brands.

  • Returns are completely free. We want your feedback to continue improving our fit, so please let us know if something feels off.

  • We focus on the sizes that best align with our fit data. Some styles may not include half sizes, but our width-inclusive design often eliminates the need to size up or down to compensate for fit.

  • Yes. We’re building thoughtfully and intentionally, guided by real customer feedback and fit data. New styles and updates will be released as we grow.

    Email us at martina@martina.shoes or drop a note here with specific requests - we want to hear from you!