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AI styling preview. Colors and details may differ from the original product photos.
adidas UltraBoost 21 'Core Black'
adidas · Style FY0378
· Released 2021-01-29
from $206.95
Select a size:
Size chart — adidas
Use the chart below to convert between US, UK, EU and JP sizes.
Men
| US | UK | EU | JP (cm) |
|---|---|---|---|
| 4 | 3.5 | 36 | 22.1 |
| 4.5 | 4 | 36 2/3 | 22.5 |
| 5 | 4.5 | 37 1/3 | 22.9 |
| 5.5 | 5 | 38 | 23.3 |
| 6 | 5.5 | 38 2/3 | 23.8 |
| 6.5 | 6 | 39 1/3 | 24.2 |
| 7 | 6.5 | 40 | 24.6 |
| 7.5 | 7 | 40 2/3 | 25.0 |
| 8 | 7.5 | 41 1/3 | 25.5 |
| 8.5 | 8 | 42 | 25.9 |
| 9 | 8.5 | 42 2/3 | 26.3 |
| 9.5 | 9 | 43 1/3 | 26.7 |
| 10 | 9.5 | 44 | 27.1 |
| 10.5 | 10 | 44 2/3 | 27.6 |
| 11 | 10.5 | 45 1/3 | 28.0 |
| 11.5 | 11 | 46 | 28.4 |
| 12 | 11.5 | 46 2/3 | 28.8 |
| 12.5 | 12 | 47 1/3 | 29.3 |
| 13 | 12.5 | 48 | 29.7 |
| 13.5 | 13 | 48 2/3 | 30.1 |
| 14 | 13.5 | 49 1/3 | 30.5 |
| 14.5 | 14 | 50 | 31.0 |
| 15 | 14.5 | 50 2/3 | 31.4 |
| 16 | 15 | 51 1/3 | 31.8 |
| 17 | 16 | 52 2/3 | 32.6 |
| 18 | 17 | 53 1/3 | 33.5 |
| 19 | 18 | 54 2/3 | 34.3 |
| 20 | 19 | 55 2/3 | 35.2 |
Women
| US | UK | EU | JP (cm) |
|---|---|---|---|
| 5 | 3.5 | 36 | 22.1 |
| 5.5 | 4 | 36 2/3 | 22.5 |
| 6 | 4.5 | 37 1/3 | 22.9 |
| 6.5 | 5 | 38 | 23.3 |
| 7 | 5.5 | 38 2/3 | 23.8 |
| 7.5 | 6 | 39 1/3 | 24.2 |
| 8 | 6.5 | 40 | 24.6 |
| 8.5 | 7 | 40 2/3 | 25.0 |
| 9 | 7.5 | 41 1/3 | 25.5 |
| 9.5 | 8 | 42 | 25.9 |
| 10 | 8.5 | 42 2/3 | 26.3 |
| 10.5 | 9 | 43 1/3 | 26.7 |
| 11 | 9.5 | 44 | 27.1 |
| 11.5 | 10 | 44 2/3 | 27.6 |
| 12 | 10.5 | 45 1/3 | 28.0 |
| 12.5 | 11 | 46 | 28.4 |
| 13 | 11.5 | 46 2/3 | 28.8 |
| 13.5 | 12 | 47 1/3 | 29.3 |
| 14 | 12.5 | 48 | 29.7 |
| 14.5 | 13 | 48 2/3 | 30.1 |
| 15 | 13.5 | 49 1/3 | 30.5 |
| 15.5 | 14 | 50 | 31.0 |
Kids
| US | UK | EU | JP (cm) |
|---|---|---|---|
| 1k | 0k | 16 | 8.1 |
| 2k | 1k | 17 | 9.0 |
| 3k | 2k | 18 | 9.8 |
| 4k | 3k | 19 | 10.6 |
| 5k | 4k | 20 | 11.5 |
| 5.5k | 5k | 21 | 12.3 |
| 6k | 5.5k | 22 | 12.8 |
| 6.5k | 6k | 23 | 13.2 |
| 7k | 6.5k | 23.5 | 13.6 |
| 7.5k | 7k | 24 | 14.0 |
| 8k | 7.5k | 25 | 14.5 |
| 8.5k | 8k | 25.5 | 14.9 |
| 9k | 8.5k | 26 | 15.3 |
| 9.5k | 9k | 26.5 | 15.7 |
| 10k | 9.5k | 27 | 16.1 |
| 10.5k | 10k | 28 | 16.6 |
| 11k | 10.5k | 28.5 | 17.0 |
| 11.5k | 11k | 29 | 17.4 |
| 12k | 11.5k | 30 | 17.8 |
| 12.5k | 12k | 30.5 | 18.3 |
| 13k | 12.5k | 31 | 18.7 |
| 13.5k | 13k | 31.5 | 19.1 |
| 1 | 13.5k | 32 | 19.5 |
| 1.5 | 1 | 33 | 20.0 |
| 2 | 1.5 | 33.5 | 20.4 |
| 2.5 | 2 | 34 | 20.8 |
| 3 | 2.5 | 35 | 21.2 |
| 3.5 | 3 | 35.5 | 21.6 |
| 4 | 3.5 | 36 | 22.1 |
| 4.5 | 4 | 36 2/3 | 22.5 |
| 5 | 4.5 | 37 1/3 | 22.9 |
| 5.5 | 5 | 38 | 23.3 |
| 6 | 5.5 | 38 2/3 | 23.8 |
| 6.5 | 6 | 39 1/3 | 24.2 |
| 7 | 6.5 | 40 | 24.6 |
| 7.5 | 7 | 40 2/3 | 25.0 |
Size sold out? Notify me
Size, price & UPC details
| Size | Price | UPC | Delivery |
|---|---|---|---|
| US M 4 / W 5 | $214.95 | 194813169228 | 3-4 business days |
| US M 4.5 / W 5.5 | $210.95 | 194813165565 | 3-4 business days |
| US M 5 / W 6 | — | 194813169211 | Out of stock |
| US M 5.5 / W 6.5 | $245.95 | 194813165589 | 3-4 business days |
| US M 6 / W 7 | — | 194813165435 | Out of stock |
| US M 6.5 / W 7.5 | — | 194813165572 | Out of stock |
| US M 7 / W 8 | — | 194813165558 | Out of stock |
| US M 7.5 / W 8.5 | — | 194813165527 | Out of stock |
| US M 8 / W 9 | — | 194813165503 | Out of stock |
| US M 8.5 / W 9.5 | $206.95 | 194813165510 | 5-7 business days |
| US M 9 / W 10 | — | 194813165466 | Out of stock |
| US M 9.5 / W 10.5 | — | 194813165534 | Out of stock |
| US M 10 / W 11 | — | 194813165459 | Out of stock |
| US M 10.5 / W 11.5 | — | 194816368369 | Out of stock |
| US M 11 / W 12 | — | 194813165497 | Out of stock |
| US M 11.5 / W 12.5 | $372.95 | 194813165541 | 3-4 business days |
| US M 12 / W 13 | $372.95 | 194813169204 | 3-4 business days |
| US M 12.5 / W 13.5 | — | 194813165473 | Out of stock |
| US M 13 / W 14 | — | 194813165480 | Out of stock |
| US M 13.5 / W 14.5 | — | 194811760267 | Out of stock |
| US M 14 / W 15 | — | 194813165442 | Out of stock |
| US M 14.5 / W 15.5 | — | 194811760250 | Out of stock |
| US M 15 / W 16 | — | 194813165596 | Out of stock |
| US M 16 / W 17 | — | 194819545170 | Out of stock |
| US M 17 / W 18 | — | 194819545163 | Out of stock |
| US M 18 / W 19 | — | 194819545156 | Out of stock |
About the adidas UltraBoost 21 'Core Black'
The adidas UltraBoost 21 ‘Core Black’ applies a rudimentary palette to a performance running shoe that combines lightweight comfort with enhanced energy return. Recycled Primeblue materials, including Parley Ocean Plastic, goes into the construction of the knit upper, fortified with a midfoot cage and molded heel counte. An optimized Boost midsole, made with 6% more Boost capsules than the UltraBoost 20, features added responsiveness via a new Torsion system that adidas calls Linear Energy Push.
| Silhouette | UltraBoost 21 |
|---|---|
| Colorway | Core Black/Core Black/Grey Four |
| Material | Primeknit+ |
| Season | 2021 |
| Release Date | 2021-01-29 |
What buyers say about us
Selected customer feedback. Feedback about our store and the buying experience, from sold.supply, eBay and Trustpilot. The source and purchase verification are shown on each card. These are not product ratings.
La entrega fue muy rapida y la atención…
La entrega fue muy rapida y la atención para la devolución también.
Gracias.Easy experience
Easy experience. My wife loves her sneakers!Purchased item
adidas SL72 RS 'Collegiate Orange Bright Blue'
No hassle and shoes look just as good as photos
Ordered with no hassle and the checkout was quick. The shoes look just as good as the photos, fit true to size, and feel comfortable right out of the box. I'd happily order from here again.Purchased item
On Running Cloudvista 3 'Ivory Wash'
They had many colors in the shoe I…
They had many colors in the shoe I wanted plus best price on the whitaker rejuven8s. The communication was great and shoes shipped quickly. I bought all 3 colors, they look better in person!!