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Getting the Right Size: Everything You Need to Know

Choosing the proper size in a pair of Hermès sandals is more significant than in many other types of footwear. Because Hermès uses high-density, structured hide, a sandal that is even half a size too small will cannot accommodate a larger foot in the way that softer, cheaper leather might. On the other hand, a sandal that is too big will slide, bunch the leather in unflattering ways, and wear unevenly. The break-in process that transforms Hermès sandals from firm to perfectly fitting assumes a correct starting size — the leather adapts to your personal foot anatomy within its right size.

This guide covers the complete sizing picture for Hermès sandals: how Hermès sizing works relative to other systems, the how the Oran and Izmir each fit, accurate foot measuring technique, and options for between-size situations. It also handles special cases — various foot anatomies and material variations.

How Hermès Sizes Work

Hermès sandals use European (Paris) sizing, which runs in full and half sizes. This is a foot-length-based system using Paris point units — one Paris point is about 6.67mm. The Hermès size range for sandals usually runs from EU 34 up to EU 42. European sizing correlates 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 translations are general approximations and apply to medium-width feet.

One key distinction of Hermès sizing is that it varies slightly between styles. The Oran and Izmir are constructed on different shoe forms, and the same EU size may fit slightly differently in each. A significant number of wearers find that their Izmir and Oran sizes are a half-step apart, even hermes men’s leather sandals in the same numerical size. This is not a quality issue — it is a reflection of the different last shapes.

Sizing the Hermès Oran: Specific Guidance

The Hermès Oran generally fits true to European size for average foot widths. For a purchase made without in-person fitting, the wisest option is to begin with your correct EU number determined by measuring your foot. If your foot is on the boundary between sizes, going up by a half-size is generally safer, because the leather cannot stretch into a larger length but will conform comfortably to a slightly generous fit as the leather softens.

For feet wider than average — specifically, for feet that are significantly wider than average for their length — the Oran sizing strategy shifts. The H-shaped upper has a set width at any given size, and a very wide foot may feel constrained by it. Choosing the next half-size up could create more width across the vamp. The cost is a marginally elongated fit, which can make the heel strap feel loose even when set at maximum tension. Some buyers with wider feet resolve this through minor cobbler work to the strap.

Izmir-Specific Sizing: Key Izmir Sizing Rules

The Izmir’s closed-back design introduces a different fitting situation than the Oran. Because the back is permanent rather than variable, the how the sandal sits on the back of the heel is completely defined by the size chosen. For typical heel breadth, the Izmir matches EU sizing consistently — the leather fits closely around the back without pinching and without slipping. For fine heels, choosing a half-size smaller may provide a more secure fit. For substantial heel bones, going a half-size larger gives the enclosed back additional room.

The how the Izmir conforms over time involves the enclosed back conforming to the heel’s specific contours, which needs five to ten uses in standard calfskin. If the enclosed back feels acutely uncomfortable rather than merely stiff and new, it is sensible to check the sizing — genuine acute discomfort, rather than the normal stiffness of new hide, could suggest incorrect sizing.

Accurate Foot Measurement: Step-by-Step Guide

The most reliable way to find your correct Hermès fitting if you cannot visit a store is to measure your foot precisely and compare against Hermès’s published size chart. To measure accurately: step on paper with full body weight, place the paper against a wall with your heel touching the wall, and indicate the furthest point of your longest toe with a pencil or pen. Count the millimetres from the wall edge to the mark — this is your foot length. Compare your measured foot length to the Hermès size chart. According to sizing experts at The RealReal, accurate foot measuring is the best indicator of resale return on fit grounds.