adidas Ultraboost 21 - Black - Silver - 10.5
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Product Information
Full details
The Adidas Ultraboost 21 is a high-performance running trainer designed for adult male runners seeking a balance of sophisticated style and advanced athletic technology. Its core benefit lies in the full-length Boost midsole, which delivers exceptional energy return and cushioning for long-distance comfort, though users should be aware that the snug fit may require sizing considerations for those with wider feet.
All features
| Age Group | adult |
|---|---|
| Colour | Black |
| Gender | Male |
| Shoe Size UK | 10.5 |
| Accent Colour | Silver |
| Shoe Type | Trainers |
| Series | Ultraboost 21 |
| Model Part Number | FY0374 |
| Brand | adidas |
Extended Product Information
FAQs
Are the Adidas Ultraboost 21 good for wide feet?
The upper is designed for a snug, foot-hugging fit. Runners with wider feet may find them tight and might consider going up a half size.
Can I put these trainers in the washing machine?
It is not recommended. Machine washing can affect the adhesive bonds and the structure of the shoe. Use hand washing instead.
Are these suitable for trail running?
These are optimized for road surfaces and light urban paths. They may lack the aggressive lug depth required for technical or muddy trails.
What is the primary difference between these and previous versions?
The Ultraboost 21 features an increased amount of Boost foam in the heel and a redesigned torsion system for improved stiffness and energy return.
How long should these shoes last?
Depending on running surface and intensity, you can typically expect between 300 to 500 miles of consistent performance.
Troubleshooting
Feeling pressure on the top of the foot
Loosen the lacing system at the specific eyelets causing pressure and ensure the tongue is centered.
Slippage in the heel area
Use the runner's loop lacing technique to increase lockdown around the ankle collar.
Foam feeling firm out of the box
Boost foam often requires a short break-in period of 20-30 miles to reach optimal flexibility.
Pros and Cons
Pros
- Superior energy return through Boost technology
- Modern, versatile aesthetic suitable for multiple environments
- Highly durable outsole for long-term road use
- Excellent cushioning for impact reduction
Cons
- Snug fit may not accommodate all foot shapes
- Requires break-in time for maximum comfort
- Limited ventilation compared to pure mesh minimalist runners
Setup, Compatibility & Care
To ensure the longevity of your Ultraboost 21s, begin by ensuring the laces are tied with consistent tension across the bridge of the foot. These trainers fit true to size for most, though if you prefer extra room in the toe box, consider trying on with your intended running socks. For maintenance, remove surface dirt using a soft brush after your run. If they become heavily soiled, hand wash them in lukewarm water using mild detergent; avoid machine washing or drying, as high heat can damage the integrity of the Boost foam. Always air dry away from direct heat sources like radiators to preserve the shape.