An enhanced fit, additional boost cushioning and updated torsion system ensures the adidas Ultraboost 21 Running Shoes deliver a premium road running experience. Redesigned from the ground up and crafted utilising sustainable recycled materials.
The adidas Ultraboost 21 Running Shoes are the latest in an impressive line of innovation. Evolving over time from constant testing and feedback, the design of this running shoe has been completely overhauled for 2021. Offering a sock-like fit thanks to the stretchy and breathable Primeknit+ upper, padded collar and integrated tongue, while a heel counter and supportive midfoot cage provide security and a precision feel. The midsole has more boost than its predecessors - cushioning impact shock for an incredibly comfortable ride and working in synergy with the LEP Torsion System to give a stable transition through to a high energy toe-off. Finally, an updated Stretchweb outsole with Continental™ Rubber ensures long-lasting durability and grip.
With 6% more Boost capsules present in the midsole, this current iteration in the Ultraboost series creates a softer underfoot feel that explodes with forward propelling energy.
Delivering incredible energy return, the LEP Torsion System supports the midfoot for a smooth transition and provides a 15% increase in forefoot bending stiffness for a more responsive run.
Made with Primeblue - a high-performance recycled material made in part with Parley Ocean Plastic. 50% of the upper is textile, 75% of the textile is Primeblue yarn and no virgin polyester has been utilised making this the most sustainable Ultraboost model to date.
The brands of the adidas Group complement each other in a unique way to help athletes perform better, play better, feel better. adidas products break records, set trends, make history. Every day. All over the world. It is not only about faster shoes and fashion statements. Just as a shoe is more than padding and foam, there is more to adidas than just the product. Everything adidas do is bound by one simple thought: strive to help you perform at your best. Your success is their ambition. Your defeat spurs them on to be better.
| UK Shoe | cm | EU Shoe | US Male Shoe |
| 5 | 23.3cm | 38 | 5.5 |
| 5.5 | 23.8cm | 38.6 | 6 |
| 6 | 24.2cm | 39.3 | 6.5 |
| 6.5 | 24.6cm | 40 | 7 |
| 7 | 25cm | 40.6 | 7.5 |
| 7.5 | 25.5cm | 41.3 | 8 |
| 8 | 25.9cm | 42 | 8.5 |
| 8.5 | 26.3cm | 42.6 | 9 |
| 9 | 26.7cm | 43.3 | 9.5 |
| 9.5 | 27.1cm | 44 | 10 |
| 10 | 27.6cm | 44.6 | 10.5 |
| 10.5 | 28cm | 45.3 | 11 |
| 11 | 28.4cm | 46 | 11.5 |
| 11.5 | 28.8cm | 46.6 | 12 |
| 12 | 29.3cm | 47.3 | 12.5 |
| 12.5 | 29.7cm | 48 | 13 |
| 13 | 30.1cm | 48.6 | 13.5 |
| 13.5 | 30.5cm | 49.3 | 14 |
| 14 | 31cm | 50 | 14.5 |
| 14.5 | 31.4cm | 50.6 | 15 |
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