Getting the Right Size: Why It Matters More Than You Think

Getting the right size in a pair of Hermès sandals is more significant than in the majority of shoe types. Because Hermès uses high-density, structured hide, a sandal that is half a size below your correct fit will cannot accommodate a larger foot in the way that less substantial leather could. Equally, a sandal that is too large will shift around, compress the material awkwardly, and age inconsistently. The conditioning period that makes Hermès sandals progressively more comfortable assumes a correct starting size — the leather molds to your individual foot shape within its right size.

The following addresses all aspects of Hermès sizing for Hermès sandals: Hermès size equivalents in other systems, the specific fit characteristics of the Oran and Izmir, how to measure your foot correctly, and what to do when you are between sizes. It also addresses some specific scenarios — various foot anatomies and material variations.

How Hermès Sizes Work

Hermès sandals use Paris point sizing, which is available in full and half increments. This is a foot-length-based system using Paris point units — one Paris point is about 6.67mm. The size options in the Hermès sandal range usually runs from EU hermes slides for womens 34 up to EU 42. EU sizes convert to other systems as follows: EU 37 = US Women’s 7 = UK 4; EU 38 = US Women’s 7.5–8 = UK 5; EU 39 = US Women’s 8.5–9 = UK 6; EU 40 = US Women’s 9–9.5 = UK 6.5. These equivalents are not exact and work best for standard foot widths.

One significant detail of Hermès sizing is that it differs modestly between models. The Oran and Izmir are built on different foot-shaped frames, and the same numerical size may vary in each. Many buyers report that their size in the Izmir versus the Oran differs by one half-size, even in the same European size. This is not a quality issue — it is a reflection of the different last shapes.

How to Size the Oran: The Oran Sizing Guide

The Hermès Oran usually runs true to EU size for average foot widths. For a purchase made without in-person fitting, the safest approach is to start with your true EU size measured from your actual foot length. If your foot length falls in the middle of two sizes, choosing the larger half-size usually works better, because the Oran’s leather will not stretch to accommodate excess length but will conform comfortably to a slightly generous fit as the leather softens.

For broader feet — especially for feet noticeably broader than standard — the sizing approach changes. The H-cutout vamp has a fixed width at any given size, and a quite broad foot can feel restricted by it. Sizing up by half a full size can provide additional room in the upper. The cost is a marginally elongated fit, which can cause the back strap to feel insufficiently taut even when set at maximum tension. Some wide-footed buyers address this by having a cobbler make minor modifications to the strap.

Izmir-Specific Sizing: How to Size the Izmir

The Izmir’s sealed heel produces a distinct sizing need than the Oran. Because the back is permanent rather than variable, the fit across the heel and back of the foot is completely defined by the size chosen. For typical heel breadth, the Izmir runs true — the leather sits securely against the heel without tightening or slipping off. For slim heel bones, choosing a half-size smaller could give a more stable feel. For broad heels, going a half-size larger provides more heel space.

The break-in process for the Izmir involves the enclosed back molding to the exact heel shape, which takes 5–10 wears in Epsom leather. If the closed heel causes real pain rather than just firm and new, it is worth reassessing the size — genuine acute discomfort, rather than the typical tightness of unworn calfskin, might signal the wrong size was chosen.

How to Measure Your Foot: Getting the Right Measurement

The most dependable approach to find your correct Hermès fitting when boutique access is not available is to measure your foot precisely and check against the Hermès size guide. To get the right measurement: stand on a piece of paper with your full weight on the foot, put the paper against a wall and position your heel to the wall, and mark the tip of your longest toe with a marker. Measure the distance from the wall to the mark in millimeters — this distance equals your foot length. Compare your measured foot length to the Hermès size chart. According to sizing experts at The RealReal, correct foot length is the clearest predictor of resale return on fit grounds.