Brand Guides
Adidas Size Guide
2 min read · Updated July 1, 2026
Adidas fit is more consistent than Nike's across lines, but two silhouettes — Ultraboost and Samba — need specific handling. Everything else runs close to true.
Performance running: true to size, narrow
Ultraboost, Adizero and Solarboost all fit true to size in length but run slightly narrower than Nike's equivalent. Wide-footed runners size up half a size or select the Wide variant when offered.
Originals: mostly true, with exceptions
| Silhouette | Fit vs true | Recommendation |
|---|---|---|
| Stan Smith | True to size | Buy your usual |
| Superstar | Half size large | Size down 0.5 |
| Samba | Half size large, narrow | Size down 0.5, wide feet stay |
| Gazelle | True to size | Buy your usual |
| Campus | Half size large | Size down 0.5 |
| Ultraboost | True to size, narrow | Wide feet up 0.5 |
| Forum Low | True to size | Buy your usual |
EU labeling uses half sizes
Unlike traditional EU sizing, Adidas prints half sizes (42, 42.5, 43, 43.5). Match the US size and read the EU label as-is; don't try to round.
Terrex: size up for socks
The Terrex outdoor line runs true to size in warm-weather footwear but tight in insulated boots. For winter Terrex, size up half a size to accommodate a thicker sock.
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Frequently asked questions
- Does Samba really run large?
- Yes. Most wearers go down half a size, especially the OG and Classic. The Samba XLG runs closer to true.
- Are Ultraboost and Pegasus interchangeable in size?
- In length, yes. Ultraboost is narrower — if Pegasus fits you snugly, Ultraboost may feel tight.
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Related articles
Nike Size Guide
How Nike shoes actually fit across silhouettes — what runs true, what runs half a size large, and how women's compares to men's.
US vs EU Shoe Sizes Explained
US and EU shoe sizes measure different things on different scales. Here's exactly how they convert and where the systems disagree.
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Reviewed by the SizeAtlas editorial team · Last updated July 1, 2026