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AI styling preview. Colors and details may differ from the original product photos.
adidas UltraBoost 21 'Triple Black'
adidas · Style FY0306
· Released 2021-01-28
from $183.95
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 | — | 191985087992 | Out of stock |
| US M 4.5 / W 5.5 | — | 191985088081 | Out of stock |
| US M 6 / W 7 | $227.95 | 191985088005 | 3-4 business days |
| US M 6.5 / W 7.5 | $220.95 | 191985091692 | 3-4 business days |
| US M 7 / W 8 | $213.95 | 191985087916 | 3-4 business days |
| US M 7.5 / W 8.5 | $183.95 | 191985087978 | 3-4 business days |
| US M 8 / W 9 | — | 191985087909 | Out of stock |
| US M 8.5 / W 9.5 | — | 191985087954 | Out of stock |
| US M 9 / W 10 | — | 191985088043 | Out of stock |
| US M 9.5 / W 10.5 | $313.95 | 191985088012 | 3-4 business days |
| US M 10 / W 11 | — | 191985088074 | Out of stock |
| US M 10.5 / W 11.5 | — | 191985087930 | Out of stock |
| US M 11 / W 12 | $335.95 | 191985087923 | 3-4 business days |
| US M 11.5 / W 12.5 | — | 191985091708 | Out of stock |
| US M 12 / W 13 | — | 191985087985 | Out of stock |
| US M 12.5 / W 13.5 | — | 191985087947 | Out of stock |
| US M 13 / W 14 | — | 191985091722 | Out of stock |
| US M 14 / W 15 | — | 191985088067 | Out of stock |
| US M 15 / W 16 | — | 191985088050 | Out of stock |
About the adidas UltraBoost 21 'Triple Black'
The adidas UltraBoost 21 ‘Triple Black’ delivers a stealthy iteration of a performance running shoe that takes advantage of more Boost cushioning and a more responsive ride than its predecessor. A flexible Primeknit upper, incorporating Parley Ocean Plastic and other recycled materials, sits atop a black Boost midsole that packs 6% more Boost capsules. Underfoot, Linear Energy Push technology provides 15% more forefoot stiffness to produce improved energy return with each step.
| Silhouette | UltraBoost 21 |
|---|---|
| Colorway | Core Black/Core Black/Core Black |
| Material | Primeknit+ |
| Season | 2021 |
| Release Date | 2021-01-28 |
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.
Easy experience
Easy experience. My wife loves her sneakers!Purchased item
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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!!Fast shipper and I’m glad I found them
Fast shipper and I’m glad I found them. I have been looking for these bred 11s for the longest. The sneakers were authentic and nicely boxed. I will definitely order from this store again.Purchased item
Air Jordan 11 Retro 'Bred' 2019