Prototype after prototype. Innovation after innovation. Testing after testing. Meet us in the hot pursuit of the pinnacle harmonization of weight, cushioning, and responsiveness. Ultraboost 21. Say hello to incredible energy return.
- Sock-like fit
- Lace closure
- adidas Primeknit+ upper
- Textile lining
- Supportive heel counter
- Boost midsole
- Weight: 340 g
- Midsole drop: 10 mm (heel 30.5 mm / forefoot 20.5 mm)
- Primeblue
- Color: core black/core black/grey four
- Product Code: FY0378
We don't want you to choose the wrong size when you order online. So, to make things a little easier for you we created simple, easy-to-read size charts to find the right size for any adidas product.
To find your perfect size, just click on the Size Guide button on the product page to see the corresponding chart.
Not the right size after all? No worries, returns are free and easy and you will receive a refund. Check out our return policy for more details.
| US - MEN | US - WOMEN | CM | UK | EUROPE |
|---|---|---|---|---|
| 4 | 5 | 22.1 cm | 3.5 | 36 |
| 4.5 | 5.5 | 22.5 cm | 4 | 36 2/3 |
| 5 | 6 | 22.9 cm | 4.5 | 37 1/3 |
| 5.5 | 6.5 | 23.3 cm | 5 | 38 |
| 6 | 7 | 23.8 cm | 5.5 | 38 2/3 |
| 6.5 | 7.5 | 24.2 cm | 6 | 39 1/3 |
| 7 | 8 | 24.6 cm | 6.5 | 40 |
| 7.5 | 8.5 | 25.0 cm | 7 | 40 2/3 |
| 8 | 9 | 25.5 cm | 7.5 | 41 1/3 |
| 8.5 | 9.5 | 25.9 cm | 8 | 42 |
| 9 | 10 | 26.3 cm | 8.5 | 42 2/3 |
| 9.5 | 10.5 | 26.7 cm | 9 | 43 1/3 |
| 10 | 11 | 27.1 cm | 9.5 | 44 |
| 10.5 | 11.5 | 27.6 cm | 10 | 44 2/3 |
| 11 | 12 | 28.0 cm | 10.5 | 45 1/3 |
| 11.5 | 12.5 | 28.4 cm | 11 | 46 |
| 12 | 13 | 28.8 cm | 11.5 | 46 2/3 |
| 12.5 | 13.5 | 29.3 cm | 12 | 47 1/3 |
| 13 | 14 | 29.7 cm | 12.5 | 48 |
| 13.5 | 14.5 | 30.1 cm | 13 | 48 2/3 |
| 14 | 15 | 30.5 cm | 13.5 | 49 1/3 |
| 14.5 | 15.5 | 31 cm | 14 | 50 |
| 15 | 31.4 cm | 14.5 | 50 2/3 | |
| 16 | 31.8 cm | 15 | 51 1/3 |
Prototype after prototype. Innovation after innovation. Testing after testing. Meet us in the hot pursuit of the pinnacle harmonization of weight, cushioning, and responsiveness. Ultraboost 21. Say hello to incredible energy return.
- Sock-like fit
- Lace closure
- adidas Primeknit+ upper
- Textile lining
- Supportive heel counter
- Boost midsole
- Weight: 340 g
- Midsole drop: 10 mm (heel 30.5 mm / forefoot 20.5 mm)
- Primeblue
- Color: core black/core black/grey four
- Product Code: FY0378
We don't want you to choose the wrong size when you order online. So, to make things a little easier for you we created simple, easy-to-read size charts to find the right size for any adidas product.
To find your perfect size, just click on the Size Guide button on the product page to see the corresponding chart.
Not the right size after all? No worries, returns are free and easy and you will receive a refund. Check out our return policy for more details.
| US - MEN | US - WOMEN | CM | UK | EUROPE |
|---|---|---|---|---|
| 4 | 5 | 22.1 cm | 3.5 | 36 |
| 4.5 | 5.5 | 22.5 cm | 4 | 36 2/3 |
| 5 | 6 | 22.9 cm | 4.5 | 37 1/3 |
| 5.5 | 6.5 | 23.3 cm | 5 | 38 |
| 6 | 7 | 23.8 cm | 5.5 | 38 2/3 |
| 6.5 | 7.5 | 24.2 cm | 6 | 39 1/3 |
| 7 | 8 | 24.6 cm | 6.5 | 40 |
| 7.5 | 8.5 | 25.0 cm | 7 | 40 2/3 |
| 8 | 9 | 25.5 cm | 7.5 | 41 1/3 |
| 8.5 | 9.5 | 25.9 cm | 8 | 42 |
| 9 | 10 | 26.3 cm | 8.5 | 42 2/3 |
| 9.5 | 10.5 | 26.7 cm | 9 | 43 1/3 |
| 10 | 11 | 27.1 cm | 9.5 | 44 |
| 10.5 | 11.5 | 27.6 cm | 10 | 44 2/3 |
| 11 | 12 | 28.0 cm | 10.5 | 45 1/3 |
| 11.5 | 12.5 | 28.4 cm | 11 | 46 |
| 12 | 13 | 28.8 cm | 11.5 | 46 2/3 |
| 12.5 | 13.5 | 29.3 cm | 12 | 47 1/3 |
| 13 | 14 | 29.7 cm | 12.5 | 48 |
| 13.5 | 14.5 | 30.1 cm | 13 | 48 2/3 |
| 14 | 15 | 30.5 cm | 13.5 | 49 1/3 |
| 14.5 | 15.5 | 31 cm | 14 | 50 |
| 15 | 31.4 cm | 14.5 | 50 2/3 | |
| 16 | 31.8 cm | 15 | 51 1/3 |