• Terrain


    Shoes best for road, track and light gravel. See the best road shoes.


    Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

    Good to know

    As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

  • Arch support

    Neutral / cushion / high arch

    Shoes for runners who do not need any additional arch support (Around 50% of runners). Best for people with normal, high or medium high arches. See the best neutral shoes.

    Stability / overpronation / normal arch

    Shoes for runners who need mild to moderate arch support (Around 45% of runners). Best for runners with a low arch. See the best stability shoes.

    Motion control / severe overpronation / flat feet

    Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

    Good to know

    - Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
    - More about arch support in this video.
    - Find your arch type by following steps from this video.

  • Use

    Daily running

    Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


    Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

    Good to know

    If you want just one pair of shoes, buy a shoe for daily running.

  • Price
  • Weight
    Men: 10.7oz
    Women: 9oz
  • Heel to toe drop
    Men: 10mm
    Women: 10mm

    The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

    There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.

  • Heel height
    Men: 30mm
    Women: 30mm
  • Forefoot height
    Men: 20mm
    Women: 20mm
  • Width
    Men: normal
    Women: normal
  • Release date
    Jun 2016
  • Special editions
Show more facts


Expert Reviews

Experts are runners, who post reviews at youtube, directly at RunRepeat or at their own websites. Each expert is categorized from level 1 to level 5 based on expertise. See stats on expert reviews and how we calculate scores here.

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85 / 100 based on 26 expert reviews

  • 85 / 100 | Jiachao Lin

    Adidas Ultra Boost Uncaged – A sock on tires

    I got this pair of Ultraboost Uncaged off a Black Friday sale last year (2018), and I’ve been wearing them for one and a half months as my dailies and occasional running shoes.

    These shoes have opened my eyes to some of the features and technologies more modern shoes have as compared to my 4-year-old Mizuno racer.


    What's to like?

    Wow, the Ultra Boosts have a lot going for them. Here’s a list to help:


    They look sleek and go well together with most clothes.

    These boots look awesome and easy to match with most of my outfits. That’s why I’m able to wear them as my dailies. I usually match them with shorts or a pair of slim jeans for my daily wear in school and any running clothes for running.


    Fit & breathability

    They are breathable and fits wide feet. As you might have heard from all the other reviews of this shoe, indeed it feels like I’m wearing a sock instead of a shoe.

    I live in Singapore, a concrete jungle with a climate constant heat and humidity, so keeping myself cool and dry has always been one of my top priorities. Nobody wants to have sweaty feet and that moisture locked in a shoe that’s unbreathable. And that’s why I love the Primeknit uppers on this shoe.



    Another reason why I love the Primeknit material is it's stretchable. It accommodates my wide feet better than most other narrow running shoes. Though the outer sides are exposed to more wear and tear, it is still quite comfortable for a wide footed person like me.

    Heel to toe drop

    They have lots of bounce and have a nice heel-toe drop. This obviously refers to the boost material the soles are made of. As compared to other more serious running shoes like those from Mizuno Wave series, the spring and bounce in the Ultra boosts are quite substantial.

    That coupled with the ample cushioning at the heel gives the feel of walking on a spring. The heel-toe drop sort of gives me the extra push I usually get from my Mizuno running shoes.

    What's not to like

    Heel tab

    The heel tab digs into your feet. Though this is a small complaint and only affects me when I’m wearing no show socks, this is still a big con for me.

    The stitched tongue of the shoe usually runs a bit high and digs into the soft area on my feet. That can cause a bit of irritation if you tend to wear no show socks and also walk for long distances.


    Too roomy forefoot

    The Primeknit makes it too roomy in the forefoot while running. Ironically, the Primeknit also makes it slightly uncomfortable to sprint in.

    Because of the stretchy material, even with the laces tightened, my forefoot tends to move around in the shoe laterally when I make those 30/60 sprints. I know that this is also partially due to the way I stride, but this is also the first time I had this problem while running.

    Lacks control & tightness

    Lack of control of elastic material tightness around the ankles. This one might be specific to some people.

    My complaint is that because of how the uncaged Boosts grab on to your ankles, there is no way to control the tightness of the grip, which sometimes makes it too tight and thus uncomfortable. I guess this is just one of the trade-offs when you go uncaged.



    This might vary depending on where and when you buy your boosts as well as which colorway you choose. I copped mine during the Black Friday sale of 2018 on Adidas’s online store for 168 SGD with shipping.


    The Ultraboost Uncaged is a good pair of daily as well as the occasional running shoes. Its Primeknit makes it comfortable and cooling (the color I chose is easy to get dirty, though that’s a personal choice).

    After my 1.5 months of daily use and abuse, the soles still look fresh, congruent to the advertising of their Continental rubber soles. It’s overall a great shoe that ticks all the boxes for me. It’s comfortable, breathable and durable. It’s a sock on tires.


    This expert has been verified by RunRepeat. Reviews are neutral, unbiased and based on extensive testing.

  • 86 / 100 | Hes Kicks

    I think they're really comfortable and I like the overall look of these.

  • 88 / 100 | Mr. Stoltz

    The new Ultra Boost Uncaged is simply epic. It is, by far, one of the most comfortable shoes I've ever worn, and even better than the previous Ultra Boost.

  • 91 / 100 | WearTesters

    If you don't want to spend $180 on a "fashion runner," then don't, but don't let the Ultra Boost Uncaged fool you-it performs as well or better than ANY other shoe out there, provided you acknowledge the support factor.

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Updates to Adidas Ultra Boost Uncaged

  • Endless energy is given to the runner when they put on the Adidas Ultra Boost Uncaged. This running shoe delivers responsive cushioning, which is also lightweight and flexible. A boost of energy makes each step feel enabled, and it’s largely thanks to the springy boost™ full-length foam. The upper coverage looks and feels like a sock, thus permitting freedom of movement.
  • The outsole unit of this running shoe makes use of a rubber material that is elastic. It adapts to how the foot comes in contact with the ground, thus keeping it balanced and well-supported. It also works with the mid-sole in order to make the heel-to-toe transitions as smooth as possible for the wearer. The outsole isn’t stiff, as well.
  • The platform of the Adidas Ultra Boost Uncaged uses the high quality boost™ technology. Its springy nature energizes each step, allowing runners to land comfortably on the ground and then lift off with more oomph. It’s made from durable materials, so it won’t easily break down.
  • The upper unit features the Primeknit system, an engineered material that looks and feels like a woven fabric. It moves along with the foot, expanding as it lands on the ground and flexing as it rears for the toe-off. The SOCKFIT construction reduces irritation, especially when wearing the Adidas Ultra Boost Uncaged without actual socks.

Adidas Ultra Boost Uncaged size and fit

The Adidas Ultra Boost Uncaged uses standard measurements for its length. Men and women are able to get the correct size when selecting this model. The available width for both genders is medium, so those with medium sized feet are able to acclimate well to it when wearing it. Its semi-curved shape follows the natural curve of the human foot.


The STRETCHWEB outsole shields the rest of the sole unit from wear and tear. Its elastic nature adapts to the surface, expanding itself to balance out each step the runner takes. It even works alongside the mid-sole to return energy to the runner. This rubber material also delivers reliable surface traction, which is essential for every running session.


The boost™ midsole, the same material used in the Ultra Boost 19, is made up of thousands of TPU pellets that have been molded together. This material is lightweight and responsive. Its springy nature energizes the runner, making each landing well-cushioned and each liftoff more enabled.

Mid-foot integrity is given by the TORSION® SYSTEM. It also allows the rear and the front sections of the foot to move independently, thus causing each step to become smoother and more efficient.


The Primeknit is a material that feels like cloth. It follows the shape and motion of the foot, essentially giving way for natural movement. It’s lightweight and flexible, too.

The SOCKFIT lets the runner feel a snug and secure fit. It works like a sock, wrapping the foot comfortably without causing skin irritation.

The FITFRAME 3D-Molded TPU is placed in the heel area. It stabilizes the heel and keeps it in place, so it basically prevents wobbling of the foot, as well as accidental shoe removals.