Adidas UltraBoost 21 Review Analysis (2021)
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Half sneaker, half running shoe, the Adidas UltraBoost 21 is a sleek and comfortable option for your daily runs.
The Consensus
Technologies
Outsole
- The outsole of the Adidas Ultra Boost 21 uses Stretchweb Continental: a resistant rubber with a unique tread pattern to optimize durability and traction on city surfaces.
Midsole
- Boost equips this new UB model. Adidas’s leading midsole technology consists of thousands of little balls in thermoplastic polyurethane fused to absorb shocks and improve the bounce.
- Also, the Linear Energy Push is a torsion system that increases the structure of the platform to maximize the energy return. According to Adidas, this technology improves forefoot rigidity by 15% for a snappier toe-off.
- The removable insole improves the comfort inside the shoe and helps with regulating humidity.
Upper
- The Adidas UltraBoost 21’s upper features Primeknit: a stretchy, lightweight, breathable, and smooth-looking engineered knit that comfortably wraps around the athlete’s foot for a fitted and comfortable foot lockdown.
- Primeblue is an engineered textile composed of at least 50% of recycled Parley Ocean Plastic to reduce the carbon footprint of the shoe.
- The bootie construction reduces irritations and makes it easy to put on and take off your shoes.
- The external heel counter keeps the foot secured in the shoe to prevent slippage
Facts
Technical Specs
| Terrain | Road |
| Pronation type | Neutral |
| Drop | 10 mm |
| Heel stack height | 31 mm |
| Forefoot stack height | 21 mm |
| Features | Recycled materials |
| Weight (men) | 348 g/12.3 oz |
| Weight (women) | 316 g/11.1 oz |
| Release year | 2021 |
Cushioning
| Softness (1-5) | 2 – Firm |
| Bounce (1-5) | 2 – Low |
Technologies
| Outsole | Stretchweb Continental |
| Midsole | Boost, Linear Energy Push, removable insole |
| Upper | Primeknit, Primeblue, bootie construction, external heel counter |
Use
| Speed | Slow, moderate |
| Distance | Mid, long, 10k, half marathon |
| Workout | Daily runs |
Reference: Adidas’ official website
Comparisons – Adidas UltraBoost 21 vs.:
Adidas UltraBoost 20
The UB21 has more cushioning with its higher stack height featuring more BOOST. However, it makes it heavier, and it weighs 0.7 oz/20 g more than the UB20. For the rest, the cushioning is similar. Good to note: the UltraBoost 21 is less narrow, which was one of the main negative points of the previous model.
Frequently Asked Questions (FAQs)
This shoe dropped just recently, and we don’t have enough feedback from runners yet to give a definite answer. We will update this section as soon as we have more information. However, overall, Adidas running shoes tend to fit true to size. In any case, if this is your first pair of Adidas, a trip to the store is always better.
Yes, this model should be suitable for everyone. Indeed, it’s a neutral running shoe. Therefore, it aims to suit all runners independently from their pronation type. It doesn’t have stability technologies to correct the stride and reduce overpronation. Anyway, let’s note that shoe models for overpronation are no more effective than neutral shoes to prevent injury. Accordingly, we advise that you choose your running shoes according to their comfort, the most critical criterion.
Yes, this model should be just fine as it has a generous stack height with 31 mm under the heel and 21 mm under the forefoot, which is sufficient for the vast majority of runners.
Yes, this Adidas running shoe is very well suited for different workouts and distances. As far as the marathon is concerned, it depends above all on how you feel. If you can have multiple long training sessions (12 mi/20 km and beyond) without pain or discomfort, then it should be a good choice for your event.