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/100 by , posted on .

I’ll admit, it was the sale that sold me. I had been scrolling past these shoes for months attracted to the look, but not so impressed by the price tag.

When the box arrived, I was giddy with excitement to try them, only to find my standard size was a ½ size too small. When the new pair of the Adidas Ultra Boost X arrived, I crossed my fingers and hoped it was worth the wait.


Upper & looks

The midsole boost dominates the look. The shoe appears to be floating on a foam cloud.

The upper is continuous knit. The plastic heel counter and eye laces are the only pieces added to the top’s knit body. There is no tongue and has a sock-like feel when you slip them on.

Adidas has many colors to choose from. When I took them out of the box, both of my teenagers "oohed and ahhed " at the appearance. That says something, right?

Fit & feel

The first thing I noticed was the roomy toe box. My feet are a little on the wide side, and my toes had plenty of wiggle room in these shoes. The knit exterior seemed to hug my foot and conform to my movements.  

In contrast, the midfoot was snug. My arch felt supported, and the midfoot area felt secure if not squeezed at times.



In this design, the upper is not attached to the midsole at the instep, so I was surprised at how tight this felt when I first tried them on. The heel was comfortable and did not slip. It also has interior padding that adds to the comfort. 

Due to the no tongue design, the collar was higher than other shoes, and I had to be sure to wear higher socks to avoid rubbing. This, again, created a slipper or sock-like feel to the shoe. The midsole boost lived up the the the hype and put a little extra bounce in my step as I was walking around the living room.


The boost cushioning has a springy feel and helps you feel light on your feet during longer runs. The shoe is lightweight, and the seamless upper is breathable and comfortable. 

My knees did not have any complaints after longer runs, and I felt supported by both the cushioning and the knit upper that hugged my feet.

The thin outer sole has good traction that protects your feet but is still flexible and allows you to feel the road as you run. The only area of the shoe that took some getting used to was the tighter midfoot and arch area. 



In the beginning, I felt supported, but after five miles or so, I began to feel an ache in the arch of my foot. The contrast of the tight midfoot and the roomy toe box took some getting used to. It seemed opposite to most running shoes I’ve worn where the toe box and heel feel snugger than the middle of the shoe.

The first few runs my foot cramped up. These have been my daily runners for over 100 miles now, and the shoe has held up fantastically. I still feel the cushioning of the midsole and the snug fit of the upper. 

My foot has gotten used to the midfoot and does not cramp as it did a month ago. If I am planning on a long run of 7+ miles, however, I usually grab a different pair of shoes to avoid aches and pains in my midfoot.

| Level 1 expert Verified
Hi, I'm Beth, and I’ve been running for ten years now. I run distances anywhere between 5k and half marathon. During the day I teach and often incorporate my love for running while teaching fractions, decimals, and various other skills.

Updates to Adidas Ultraboost X

  • The Adidas Ultraboost X is a running shoe that’s specifically designed for women. Its purpose is to move in accordance with the natural movement of the foot as it goes through the gait cycle. It even encompasses the majority of the shape of the foot via a specially designed upper that allows the fabric to wrap around the mid-foot section.
  • Visually, this shoe melds the design trends of running shoes and casual footwear. It has a cool look that’s not too striking, yet its different colorways allow the wearer to be more versatile when it comes to the aesthetics of their shoes. A knitted upper evokes the feeling of wearing a sock in lieu of actually wearing a sock.
  • One of the prime technologies of the Adidas brand is the boost™. Made up of compacted TPU pellets, this full-length foam offers responsive cushioning to the foot of the wearer. The outsole makes use of a rubber compound that is durable and efficient at delivering traction over the surfaces.


The rubber that is used for the outsole unit of the Adidas Ultraboost X is from Continental™. It’s a high-quality material that protects the rest of the sole unit from the abrasive nature of the roads. It also grips surfaces well, even wet ones.

The Stretchweb design of the outsole allows the platform to be more flexible. The foot is then granted the opportunity to move more naturally as it transitions through the gait cycle.


The midsole unit of the Adidas Ultraboost X features the boost™ cushioning system, which is also the same as the technology found in the Ultraboost lineup. This full-length foam is made from thousands of TPU pellets that have been amalgamated into a single unit. It provides responsive cushioning throughout the gait cycle while also ensuring comfort, even when standing idly.

The Torsion® System is a unit that holds the mid-foot in place and prevents it from wobbling as the runner performs. It is placed in the middle of the platform.


The fabric that’s used for the upper unit is called the Primeknit. This material is similar to woven cloth, so it delivers the feeling of actually wearing socks. It’s also able to accommodate natural airflow into the foot-chamber, thus delivering a cool and dry interior environment.

The mid-foot section of the upper features a Dynamic Arch design. It basically causes the upper unit to wrap around the arch, supporting it along with the whole top section of the foot. This unique design also elevates the look of the shoe.


How Adidas Ultraboost X ranks compared to all other shoes
Top 19% road running shoes
All road running shoes
Top 13% Adidas running shoes
All Adidas running shoes
Top 17% neutral running shoes
All neutral running shoes


The current trend of Adidas Ultraboost X.
Compare to another shoe:
Jens Jakob Andersen
Jens Jakob Andersen

Jens Jakob is a fan of short distances with a 5K PR at 15:58 minutes. Based on 35 million race results, he's among the fastest 0.2% runners. Jens Jakob previously owned a running store, when he was also a competitive runner. His work is regularly featured in The New York Times, Washington Post, BBC and the likes as well as peer-reviewed journals. Finally, he has been a guest on +30 podcasts on running.