As the Ultra Boost 4.0 has been released ,it is updating from the Boost 3.0.Compare with last version ,whats updating ?
We will check it today.
Featuring an upper woven with black plastic material, the shoe offers a unique striped black look that provides a striking contrast with the black plastic midfoot and heel cage. Black laces with an abstract pattern add an extra pop of detail, seems nice and matched .
Unlike the Ultra Boost ST, it prefers the reinforced support on the inner side of the running shoes, and it also differs from the Uncaged which only retaining the Primeknit uppers. As for Energy Boost 4, the old model— Tech-Fit’s upper are with EVA and Boost midsole. Isn’t this like the traditional running shoes?
The soft and comfortable Primeknit knitted upper, the plastic strip and HeelCounter heel locking system, and the famous full- Boost cushioning. full-length white Boost midsole and the Strech Web mesh rubber outsole technology ,all of are make the Ultra Boost 4.0.
There are more details as below :
The updated sole consists of a stretchy rubber in an open grid pattern that adapts to your foot’s movement and makes for a smoother transition from heel-strike to toe-off.
The toe is angled up higher, which further helps the shoe roll. Some runners may find the rigid plastic overlays around the heel and arch uncomfortable, but if the shoe fits, get ready for an ultracushioned, responsive ride. 
The mega pull tab is a visual oddity yet functionally effective, and comes in very handy when putting the shoe on. 
For the material : We were always curious to find out how adidas Primeknit compares against Nike’s version, which by the way, comes in different iterations. Like the super compressive Nike 3.0 Flyknit, or the more easy going version on the Flyknit Lunar. For now, we can only judge Primeknit based on its use in the Ultra Boost, but as time goes by, we should be exposed to more variants.it feels more elastic in places like the top of forefoot, while the edges and toe bumper have a closed knit construction for better structural support.
For the ventilation :it is nice , the forefoot top is more porous and breathable, which also makes it more accommodating to stretching.
The energy-returning boost™ technology was welcomed by many runners because, for them, it was able to deliver responsive underfoot cushioning
For the lace system : it is easy to adjust the shoes when you running .
It is show the boost symbol, the sole actual court feeling is amazing
For the traction : not many pieces of rubber here, just a single latticed sheet clothes the bottom. The exposed windows help reduce weight and increases the ride softness and consistency.
The classic Torsion System is firmly embedded in the midsole of the running shoe, extending from the forefoot to the back.Then the strip surround the HeelCounter heel locking system , and the high-density Boost and Torsion System anti-roll system are making the 4.0 ,also this setting up will be great for the runner .
The external heel counter was lauded by a user because it kept their heel in place and prevented it from wobbling or accidentally exiting the shoe
On some level, the Ultra Boost is similar to the Energy Boost 2. The two models can be compared on shared traits like a compressive upper, plastic midfoot cage and heel, and a prodigious chunk of exposed midsole hewn out of bouncy Boost foam. Even the plastic ‘Torsion’ shank dams up on the Ultra Boost’s medial heel the same way the EB-2 does. At the same time, the two differ on the quality of fit and cushioning behavior, and as always, we’ll talk about it at length before the sun goes down.
As a fashion sneakers, the fashion design is important. From the perspective of appearance, Ultra Boost 4.0 was followed the last model . but the the shoes look more smoothly and naturally, taking into account parcels and fashion trends.
We can see more details as below : 
This plastic counter also cups under the heel edges. Leaving the Achilles area free was smart design thinking
For the cushioning test : the cushioning is amazing , The heel softness is comparable to the Energy Boost 3 , but with one major difference – the midsole is far more responsive. That is caused by two factors. If you were to look at the midsole heel top down, you will notice that a good portion of the Boost foam sticks outwards, along with the outsole lip.
The outsole rubber extends slightly outwards to provide protection , and the curved upsole structure on both ends allows for smooth transitions in the responsive foot. It can be seen that the full-length Boost cushioning effect is obviously, and the heel impact is maximized when the heel strikes.
We can see the GIF picture as below :
The effect which has the narrower foam sink in and come back out soon after weight moves forward.Then a wider flare on lower midsole creates a greater contrast with the upper portion, which then becomes relatively narrower.
Overall : After having looked at the Ultra Boost from multiple wear-test angles, we know the shoe has many things working for it, the nice boost tech and the great material,an upper fit which feels snug yet comfortable, and transition quality which feels great for a shoe this cushioned. But for the supporting , it is not enough as usually . So how about you think ?