As each year passes, adidas’ Ultraboost gets even more technical. The latest to join the much-loved range, the Ultraboost 21, is proof. Take this grey pair — its primeknit uppers are reworked using plastic yarn derived from ocean waste, while the sole, Boost and Torsion included, is improved to provide even more support and energy return than before.
US Men | US Women | EU | CM | |
---|---|---|---|---|
UK 3 | 3.5 | 4.5 | 35 2/3 | 21.8 |
UK 3.5 | 4 | 5 | 36 | 22.1 |
UK 4 | 4.5 | 5.5 | 36 2/3 | 22.5 |
UK 4.5 | 5 | 6 | 37 1/3 | 22.9 |
UK 5 | 5.5 | 6.5 | 38 | 23.3 |
UK 5.5 | 6 | 7 | 38 2/3 | 23.8 |
UK 6 | 6.5 | 7.5 | 39 1/3 | 24.2 |
UK 6.5 | 7 | 8 | 40 | 24.6 |
UK 7 | 7.5 | 8.5 | 40 2/3 | 25 |
UK 7.5 | 8 | 9 | 41 1/3 | 25.5 |
UK 8 | 8.5 | 9.5 | 42 | 25.9 |
UK 8.5 | 9 | 10 | 42 2/3 | 26.3 |
UK 9 | 9.5 | 10.5 | 43 1/3 | 26.7 |
UK 9.5 | 10 | 11 | 44 | 27.1 |
UK 10 | 10.5 | 11.5 | 44 2/3 | 27.6 |
UK 10.5 | 11 | 12 | 45 1/3 | 28 |
UK 11 | 11.5 | 12.5 | 46 | 28.4 |
UK 11.5 | 12 | 13 | 46 2/3 | 28.8 |
UK 12 | 12.5 | 13.5 | 47 1/3 | 29.3 |
UK 12.5 | 13 | 14 | 48 | 29.7 |
UK 13 | 13.5 | 14.5 | 48 2/3 | 30.1 |
UK 13.5 | 14 | 15 | 49 1/3 | 30.5 |
UK 14 | 14.5 | 15.5 | 50 | 31 |
If for some reason you are not happy with your purchase you can return it to us within 30 days for an exchange or refund.
We are now offering FREE UK returns. For more information please visit our returns page