July 6, 2022

Gear Review: Adidas Ultra Boost X

“Disclaimer: I received a pair of Adidas Ultra Boost X to review as part of being a BibRave Pro. Learn more about becoming a BibRave Pro (ambassador), and check out BibRave.com to review find and write race reviews!”

To say that I’m an adidas fan is an understatement. I’ve been using adidas Ultra Boosts since my first year of running and between my boyfriend and I, we own 10 pairs of adidas shoes. Our shoe closet looks like the storage room of an Adidas store.

When BibRave gave me an opportunity to test their latest version, the adidas Ultra Boost X, I jumped at the chance. First, let’s compare the two.

Side-by-Side Comparison

Ultra Boost X (left) – Ultra Boost (right)

Clearly, the adidas Ultra Boost X has a less rigid structure than the Ultra Boosts. The plastic cage was replaced by a flexible fabric “cage.” The Ultra Boost X has the fit of a sock, which means it’s lighter and conforms to your foot. I also find it interesting how aggressive the angle is at the front of the Ultra Boost, compared to the Ultra Boost X. I guess that’s what makes the ride smoother on the Ultra Boost X… a more natural follow-through. There also seems to be more boost™ foam in the Ultra Boost X from the midfoot to the heel area.

The top view shoes how narrow the adidas Ultra Boost X is. It also shows the structure of the primeknit around the ankle. The primeknit isn’t as thick as the Ultra Boosts. The rear of the shoe is pretty much the same aside from the extra plastic heel cup on the Ultra Boosts (but not sure if that’s just for aesthetic purposes). Both have the Continental™ rubber outsole for excellent grip.

From the website

Give your last-best run some serious competition in these women’s shoes built with ultra-cushioned boost™. Designed to respond to the way your foot moves through each stride, the shoes feature a floating arch and an adidas Primeknit upper that hugs your foot throughout the gait cycle. boost™ delivers maximum energy return, and a stretchy outsole flexes to adapt to the way your foot strikes the ground.
  • Runner type: neutral
  • adidas Primeknit upper wraps the foot in adaptive support and ultralight comfort
  • boost™ is our most responsive cushioning ever: The more energy you give, the more you get
  • STRETCHWEB rubber outsole flexes underfoot for an energised ride
  • Dynamic arch for adaptive fit; TORSION® SYSTEM between the heel and forefoot for a stable ride
  • Continental™ Rubber outsole for extraordinary grip in wet and dry conditions

They come in 4 colours: orange, black, grey and white and cost $240 CDN. There are also Parley versions of the Ultra Boost X, which are partly made with recycled ocean plastic. Adidas made these shoes specifically for women.

Watch this video for an introduction to boost™ foam:

First Impressions

  • You have to get used to the fit – My feet aren’t used to that much arch support. It’s like wearing a built-in insole. I never really needed to break in Ultra Boosts but for this particular shoe, I had to. It’s not a knock on the shoe because after a few runs, my feet got used to them and became super comfortable.
  • It’s light and springy – I can see myself using these shoes on short, fast races and having lots of fun with them.
  • It looks beautiful – I’ve had more compliments on these shoes from random strangers than any other shoe.

My Review

As with the other Ultra Boosts, I do love running in the adidas Ultra Boost X. They are light, responsive, very comfortable, and my feet feel well-supported. I ran over 100 km in these shoes and enjoyed every moment of it. It took a little bit of getting used to the snug fit but ultimately, it felt like you’re running in socks with boost foam. Despite the narrow look of the toe box, I felt like my toes splayed more thanks to the flexibility of the primeknit upper. I will be wearing these in Berlin for sure! I love that the plastic cage is gone. That can sometimes feel constricting in the regular Ultra Boosts. One thing is for sure, I felt really nimble in these shoes. It also versatile and looks great as a street shoe as well as a running shoe. I did find myself choosing socks carefully though. They looked great with my Tiux compression socks, like one continuous boot. Otherwise, I would choose low profile socks like Balega and Smartwool socks.

Socks on “socks”

Smartwool (taller ones… but the lower profile ones look better)



The adidas Ultra Boost X fits true to size for me but obviously everyone is different. I suggest you find this shoe in a store and try them on. I wonder how people with lower arches (or flat feet) react to the support of the Ultra Boost X. If you’re one of these people, please leave a comment and let me know what you think of the fit. And sorry guys… adidas made these shoes specially for women only.

Buy them!

Do you love these? If you’re a US resident or have access to a US mailing address, you can get a pair by ordering at Dick’s Sporting Goods for $179.99 US.

See what other BibRave Pros thought

Heather | Amy | Jenna | Lindsey | Angie | Emily

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What do you think of the shoes? Are you an adidas fan? Let me know in the comments below if you’d try these out!

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4 thoughts on “Gear Review: Adidas Ultra Boost X

    1. Hey Ben! They made it for women only 😐 Maybe someday there will be a men’s version.

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