Are Adidas Ultraboost True to Size?
Quick Answer
The Adidas Ultraboost generally fits true to size to slightly large, thanks to its stretchy Primeknit upper. Many people find they can comfortably wear their true size or even consider a half size down for a snugger feel.
Find Your Fit
What's your foot type? Pick one for a direct answer on the Adidas Ultraboost.
What Reddit says: real owners debate Adidas Ultraboost sizing in this thread →
Detailed Sizing Information
The Ultraboost's stretchy, sock-like Primeknit upper conforms closely to the foot and has plenty of give, which is why it tends to run slightly generous compared to leather sneakers. The Boost midsole adds cushioning underfoot without affecting length or width much.
Sizing Recommendations by Foot Type
- Wide Feet: True to size usually works well thanks to the stretchy knit.
- Narrow Feet: Consider going down half a size for a snugger, more locked-in fit.
- Normal Feet: True to size is usually the best option.
Size Conversion Chart
General US / UK / EU / CM reference for adult sizing. Women's US sizing typically runs about 1.5 sizes larger than the equivalent men's US size. This is a general industry chart, not brand- or model-specific — use it as your numeric starting point, then apply the true-to-size guidance above for this particular shoe.
| US Men's | US Women's | UK | EU | CM |
|---|---|---|---|---|
| 6 | 7.5 | 5.5 | 39 | 24 |
| 6.5 | 8 | 6 | 39.5 | 24.5 |
| 7 | 8.5 | 6 | 40 | 25 |
| 7.5 | 9 | 6.5 | 40.5 | 25.5 |
| 8 | 9.5 | 7 | 41 | 26 |
| 8.5 | 10 | 7.5 | 42 | 26.5 |
| 9 | 10.5 | 8 | 42.5 | 27 |
| 9.5 | 11 | 8.5 | 43 | 27.5 |
| 10 | 11.5 | 9 | 44 | 28 |
| 10.5 | 12 | 9.5 | 44.5 | 28.5 |
| 11 | 12.5 | 10 | 45 | 29 |
| 11.5 | 13 | 10.5 | 45.5 | 29.5 |
| 12 | 13.5 | 11 | 46 | 30 |
| 13 | 14.5 | 12 | 47 | 31 |
| 14 | 15.5 | 13 | 48 | 32 |
Fit Variations by Model and Colorway
Original OG Primeknit Colorways
The original Ultraboost Primeknit builds have the most stretch and run truest to the sizing guidance above.
DNA and Updated Knit Variations
Newer Ultraboost releases sometimes use a firmer knit construction, which can feel slightly snugger than the original Primeknit.
User Experiences and Reviews
Most wearers describe the Ultraboost as true to size or slightly roomy thanks to the stretchy knit upper. Those who prefer a snugger, performance-oriented fit sometimes go down half a size.
Comparison to Other Adidas Models
| Model | Sizing Compared to Ultraboost | Fit Description |
|---|---|---|
| Adidas NMD | Similar Sizing | Both use a stretchy knit upper over Boost foam |
| Adidas Stan Smith | Narrower Fit | Stan Smith's leather upper has less give |
| Adidas Samba | Narrower Fit | Samba's flat leather build fits more snugly |
| Adidas Superstar | Narrower Fit | Superstar's shell toe fits closer to true size |
Common Questions About Adidas Ultraboost Sizing
Do Adidas Ultraboosts run true to size?
Yes, most people find them true to size or slightly roomy thanks to the stretchy knit upper.
Are Ultraboosts good for wide feet?
Yes, the stretchy Primeknit upper accommodates wide feet comfortably.