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Unboxing: Adidas ULTRABOOST 21

With a myriad of running shoes on the market, many people are likely to feel dazzled, not least when they are choosing one pair that is after their own heart. However, for many experienced runners, chances are that they have clear goals and won’t get lost facing the various choices. In my case, it is Adidas that always pops up in my mind the first moment when I am going to buy new shoes and ULTRABOOST will be my preferential choice for it is really impressive.

When the brand first launched its Adidas ULTRABOOST 21 in 2021, I failed to cop one pair myself. But later I bought a pair by chance, which has greatly changed my view toward this sport and done me a great help.

For the colorways, the number has run into 30 besides the initial white one, which, according to the official, helps empower runners.

When I look at the ULTRABOOST 21 as a whole, I just can’t help but marvel at how different the shoes look and how powerful the setups are. ULTRABOOST 21 is utterly different from its predecessors.

Compared with the traditional weaving process of PK fabric of the previous ULTRABOOST shoes, ULTRABOOST 21 adopts the PRIMEBLUE material and the vamp adopts a new weaving texture, which is not only more eye-pleasing, but also excellent in wrapping and stability. On top of that, the design is also in line with Adidas’s emphasis on environmental protection in recent years.

The TPU translucent design on the side of the shoes and the abrazine logo of “ULTRABOOST” visually refreshes the appearance of the shoes while also provides good stability for the runners.

The upturn of the heel and the thickened cushion inherits the comfort and softness exclusive to ULTRABOOST shoes.

Due to the nature of BOOST material, the shoe type of ULTRABOOST has, over the years, continued a similar design. However, in this the new ULTRABOOST 21 we can see that it has ushered in a new subversion in the midsole BOOST design.

The BOOST midsole material at the heel has been unprecedentedly thickened, which, as a result, looks a bit exaggerated while at the same time changes the usual reserved appearance of ULTRABOOST shoes.

Of course, there is more to it than that. In fact, the thickened midsole has a stronger cushioning and rebound performance and makes runners more assured.

If the thickened midsole has stunned you, then the brand new outsole design might completely overturn your expectations of it.

Compared to the previous Horse rubber outsole , this ULTRABOOST 21’s is comprised of three parts. The edge and core area of the forefoot still use the classic Horse rubber that still ensures stability and wear resistance whereas the heel outsole adopts transparent material that is quite wear-resistant and can helps prevent slipping.

Over and above that, the brand new anti-torsional system brings a new breakthrough to the performance of ULTRABOOST 21. With this upgrade, the shoes’ overall support is then guaranteed.


In the words of Moritz Hollmuller, senior director of Adidas running shoes, ULTRABOOST 21 is undoubtedly the running shoe with the most comprehensive performances in Adidas as it is an integration of excellent lightness, cushioning and rich rebound. In my view, it is synonymous with excellence.


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Adidas ULTRABOOST 21 Performance Review

I found that many runners wear the Adidas ULTRABOOST 21 to run recently. And many people are expecting this model after releasing.

As a marathon enthusiast, I concern the technology and practicability of running shoes. Let’s have a look at the insole of Ultraboost 21. The boost material is made of TPU foam. When foaming, the volume is bigger, it becomes lighter and elastic.The foaming Boost particles are white.

The characteristics of BOOST is soft, light and elastic. After squeezing, it can recover to be swelling fastly and offer great cushioning effect.

Moreover, it doesn’t need time to break-in Boost insole. It’s comfortable. According to the testing data, the performance of Boost won’t be effected by the temperature.

ULTRABOOST 21 adds 6% Boost more than ULTRABOOST 20. So the insole of ULTRABOOST 21 is thicker.

The shoe heel of ULTRABOOST 21 is widened and thickened. For most of runners, the cushion performance is better and it’s more stable. The drop height of running shoes is about 8mm. But the drop height of ULTRABOOST 21 forefoot sole and rear sole is 10mm. This drop height is more convenient for runners to run faster.

What’s the disadvantages of Boost? ULTRABOOST 21 uses LEP (Linear Energy Push) system in Boost. It’s the brand-new technology of Adidas. LEP is built-in the bottom layer of Boost insole, it’s extends from the middle part of rear sole to forefoot sole. It improves the bending rigidity of forefoot sole to offer excellent supporting performance and anti-torsion performance.

ULTRABOOST 21 uses CONTINENTAL rubber which has good abrasive resistance and traction performance.

It has hollow-out design on the rear outsole. It reduces the weight.

As a pair of running shoes, ULTRABOOST 21 also upgrade the structure of vamp. It’s made of Primeknit and Primeblue recyclable material. It’s reinforced by 2cm double layers of knit which guarantee the supporting performance of vamp. Both sides of shoe heel adds TPU plate which is also extending to the position of arch. It strengthens the heelpiece and stability of arch. It improves the protection to the ankle.

The lacing system of ULTRABOOST 21 still uses 3 pieces of transparent TPU  on both sides of vamp to improve the supporting performance.

The vamp of Ultraboost 21 is integrated. The topline uses socks type design. The topline uses double layer elastic structure. It improves the fitness. The pull-tab design of shoe heel is convenient for putting on and taking off.

The Boost is soft and elastic. The thickened 6% Boost offers excellent cushion performance. As Boost doesn’t need time to break-in, I can feel the excellent cushion performance in the beginning of running.

But Boost is soft, it’s not suitable for long-distance running. UltraBoost 21 uses LEP system and Continental outosle which can offer excellent supporting performance and stability when running.

The shoe tree of UltraBoost 21 has been changed. It has widened design on forefoot sole.

Overall, the thick Boost design of UltraBoost 21 offers excellent cushion performance. The LEP system offers good support and protection to Boost. It’s suitable for most of runners. But if you want to run full Marathon, UltraBoost 21 maybe too heavy for you, you can try Adidas zero adios pro.

UltraBoost series are popular in the market. The design is fashion, and the Boost insole is comfortable. It’s also suitable for daily dressing.