The Science Behind Stunning Style – Hermes

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

Getting the right size in a set of Hermès sandals is more significant than in many other types of footwear. Because Hermès uses full-weight, firm calfskin, a sandal that is even half a size too small will will not expand in the way that softer, cheaper leather might. Equally, a sandal that is too large will shift around, fold and crease unattractively, and wear unevenly. The leather softening process that transforms Hermès sandals from firm to perfectly fitting requires the proper starting size — the leather molds to your individual foot shape within its correct size.

This guide covers the complete sizing picture 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 handles special cases — various foot anatomies and material variations.

Understanding the Hermès Sizing System

Hermès sandals use European (Paris) sizing, which includes both whole and half sizes. This is a measurement system tracking foot length in Paris units — each Paris point equals approximately 6.67mm. The size options in the Hermès sandal range generally extends from EU 34 through EU 42. Here are the conversions from EU to other sizing systems: 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 conversions are approximate and apply to medium-width feet.

One important nuance of Hermès sizing is that it changes somewhat across designs. The Oran and Izmir are built on different foot-shaped frames, and the same EU size may fit slightly differently in each. A significant number of wearers find that their Izmir size and oran sandals their Oran size differ by half a size, even 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 feet of standard width. For a purchase made without in-person fitting, the most reliable strategy is to start with your true EU size determined by measuring your foot. If your measurement sits between two Hermès sizes, going up by a half-size is generally safer, because the leather cannot stretch into a larger length but will mold to a minimally larger shoe through the break-in process.

For broader feet — especially for feet noticeably broader than standard — the sizing approach changes. The H-cutout upper has a defined width at any given size, and a quite broad foot can feel restricted by it. Choosing the next half-size up could create more width across the vamp. The cost is a marginally elongated fit, which can cause the back strap to feel insufficiently taut even when adjusted to its tightest setting. Some buyers with wider feet resolve this through minor cobbler work to the strap.

Sizing the Hermès Izmir: Key Izmir Sizing Rules

The Izmir’s sealed heel produces a distinct sizing need than the Oran. Because the back is permanent rather than variable, the how the sandal sits on the back of the heel is wholly a function of the size picked. For average heel widths, the Izmir fits true to size — the leather wraps snugly around the heel without tightening or slipping off. For fine heels, going down one half-size could give a more stable feel. For wide heels, choosing the next half-size up gives the enclosed back additional room.

The break-in process for the Izmir means the back leather adapting to the individual heel form, which takes 5–10 wears in Epsom leather. If the closed heel causes real pain rather than merely stiff and new, it is sensible to check the sizing — true discomfort, rather than the typical tightness of unworn calfskin, may indicate that the size is incorrect.

Accurate Foot Measurement: Getting the Right Measurement

The most reliable way to identify the right Hermès size if you cannot visit a store is to take an accurate foot measurement and match to the official Hermès size chart. To get the right measurement: place your full weight on a piece of paper, align the paper to the wall and press your heel against it, and mark the tip of your longest toe with a pencil or pen. Count the millimetres from the wall edge to the mark — this distance equals your foot length. Check your measurement against the Hermès chart. According to sizing experts at The RealReal, correct foot length is the clearest predictor of fit success for online purchases.

EU Size	US Women’s (approx.)	UK (approx.)	Foot Length (mm)
36	6	3	225–230
37	7	4	231–237
38	7.5–8	5	238–243
39	8.5	6	244–250
40	9–9.5	6.5	251–256
41	10	7.5	257–263
42	11	8	264–270