adidas UltraBoost 21 Trainers - White/Black - UK 8.5
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Product Information
Full details
The adidas UltraBoost 21 'Oreo' trainers are designed for adult runners seeking a blend of performance and style. They offer exceptional energy return and adaptive comfort, with a distinct black and white colorway. While providing a superior running experience, users should be aware that the knit upper, while comfortable, may require specific cleaning to maintain its appearance.
All features
| Age Group | adult |
|---|---|
| Colour | White |
| Gender | Male |
| Shoe Size UK | 8.5 |
| Accent Colour | Black |
| Shoe Type | Trainers |
| Series | UltraBoost 21 |
| Model Part Number | S23708-85 |
| Brand | adidas |
Extended Product Information
FAQs
Are these shoes suitable for wide feet?
The Primeknit upper offers a flexible fit, but the overall shoe construction is designed for a standard width. Runners with very wide feet might find them snug.
What is the main benefit of the Boost midsole?
The Boost midsole provides exceptional energy return, meaning it captures and releases energy with each step, reducing fatigue and enhancing running efficiency.
Can I use these for hiking or trail running?
While the outsole offers good traction, these trainers are optimized for road running and smoother surfaces. Trail running or hiking may require shoes with more aggressive tread and rugged protection.
How does the 'Oreo' colorway differ from other UltraBoost 21 models?
The 'Oreo' colorway specifically refers to the black and white speckled design on the Primeknit upper and sole, offering a distinct visual style compared to solid color or other patterned variants.
What is the expected lifespan of these trainers?
The lifespan varies based on mileage, running surface, and care. However, the durable Boost midsole and robust outsole are designed for high mileage, typically several hundred miles of running.
Are they waterproof?
No, the Primeknit upper is highly breathable but not waterproof. They are designed for running in dry or moderately wet conditions, but not for heavy rain or submersion.
What size should I order if I'm between UK sizes?
Given the snug, adaptive fit of the Primeknit upper, it's often recommended to size up to the next half or full size if you are between sizes, especially if you prefer a little more room in the toe box.
Troubleshooting
Shoes feel too tight or restrictive
Ensure laces are loosened appropriately before putting on. The Primeknit upper will stretch slightly with wear to conform to your foot shape. If still uncomfortable, consider a half-size larger.
Reduced energy return or cushioning feel
The Boost midsole is designed for longevity, but cushioning can feel reduced over time with extensive use. Ensure the shoes are clean, as debris can sometimes affect performance perception. For new shoes, allow a short break-in period.
Discoloration of the white Primeknit material
Gently clean with a mild soap and water solution using a soft brush or cloth. Test any cleaning product on an inconspicuous area first. Avoid washing machines or high-pressure water.
Pros and Cons
Pros
- Excellent energy return from the Boost midsole.
- Comfortable and adaptive Primeknit upper.
- Stylish 'Oreo' colorway suitable for multiple settings.
- Good traction and durability for various running conditions.
- Supportive design aids in maintaining running form.
Cons
- Primeknit upper may require careful cleaning to preserve aesthetics.
- Best suited for neutral runners; may lack stability for severe overpronators.
- Can be a higher price point compared to basic running shoes.
Setup, Compatibility & Care
Setup: These trainers require no specific setup. They are ready to wear out of the box.
Compatibility: Designed primarily for running on roads, tracks, and treadmills. They are suitable for adult male runners with a neutral gait.
Care Instructions:
- Cleaning: Gently clean the Primeknit upper with a soft brush or cloth and mild soap solution. Avoid harsh chemicals or abrasive scrubbing.
- Laces: Remove laces and wash separately if needed.
- Midsole/Outsole: Wipe clean with a damp cloth.
- Drying: Air dry naturally away from direct heat sources. Do not machine dry.
- Storage: Store in a cool, dry place when not in use.