adidas UltraBoost 21 - White - 4
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Product Information
Full details
The adidas UltraBoost 21 is engineered for neutral runners who prioritize maximum comfort and energy return during long-distance training or daily recovery runs. It features 6% more Boost cushioning than its predecessors and a responsive Torsion system, offering a plush, stable ride. While it delivers exceptional cushioning, runners seeking an ultra-lightweight racing flat may find the added bulk of the increased foam stack slightly heavy for high-speed intervals.
All features
| Age Group | adult |
|---|---|
| Colour | White |
| Gender | Male |
| Shoe Size UK | 4 |
| Series | UltraBoost |
| Model Part Number | FY0377-45 |
| Brand | adidas |
Extended Product Information
FAQs
Is the UltraBoost 21 good for wide feet?
The Primeknit upper is quite stretchy and accommodating, making it a good choice for those with slightly wider feet, though fit preference varies.
Can these be used for gym workouts?
They are ideal for cardio and treadmill work, though the thick, plush sole provides less stability for heavy lifting like squats.
Are they water-resistant?
No, the Primeknit material is designed for breathability and will absorb water in wet conditions.
How many kilometers should these last?
Most runners find the midsole maintains its responsiveness for 500 to 800 kilometers depending on your running style and surface.
Is the midsole plastic?
The Boost midsole is made of expanded thermoplastic polyurethane (eTPU), which provides its signature bounce and durability.
Troubleshooting
Heel slipping while running
Utilize the 'runner's knot' or heel lock lacing technique using the top eyelet to secure the fit around your ankle.
Upper material showing signs of dirt
Use a soft-bristled brush with lukewarm water and mild detergent to gently scrub the Primeknit mesh.
Pros and Cons
Pros
- Exceptional cushioning for long-distance comfort
- Highly breathable upper material
- Uses eco-friendly recycled ocean plastics
- Responsive energy return through the LEP system
- Stable platform for daily training
Cons
- Heavier than traditional lightweight racing shoes
- Higher stack height may feel bulky for some runners
- Limited ground feel due to the thick midsole
Setup, Compatibility & Care
To ensure the longevity of your UltraBoost 21s, follow these guidelines: 1. Break-in: While the Primeknit is soft immediately, allow for a few short walks to ensure the heel lockdown is comfortable for your anatomy. 2. Sizing: These shoes generally fit true to size, but consider your preferred sock thickness. 3. Cleaning: Hand wash with mild soap and cold water. Do not put them in a dryer, as high heat can damage the foam properties. 4. Storage: Keep in a cool, dry place away from direct sunlight to prevent the upper fabric from fading or the sole from prematurely hardening.