• 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: 10.5oz
  • Heel to toe drop
    Men: 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: 29mm
  • Forefoot height
    Men: 19mm
  • Width
    Men: Narrow, Normal
    Women: Normal
  • Release date
    Aug 2017
  • 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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81 / 100 based on 3 expert reviews

  • 91 / 100 | bigfootLIFE

    They hug your feet in such an interesting way... Every single part of it maximizes and sucks down on your feet.

  • 90 / 100 | OhItsTeddy

    These are super comfy... I would say they're much more comfortable than the Uncaged Ultra Boost.

  • 75 / 100 | Shoeguide

    so if you’re looking for a different pair of running shoes that can survive a long mile, a hard sprint, or a casual walk around the mall, give these Asics a try.

  • First look / Unboxing | UNBOXING Fashion & Sports

Show moreless reviews
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  • The Ultra Boost Laceless is a road running shoe that is ideal for neutral pronators. With an unusual construction, it aims to be an innovative running shoe as it does away with the concept of tying shoelaces.
  • Featuring a Primeknit upper that promotes comfort by bringing a sock-like feel, it wraps around the foot and follows each motion while running.
  • The midsole is made of boost™ foam which aims to deliver the highest level of energy return and shock absorption, thus resulting in a more consistent run. Partnered with Continental™ rubber and STRETCHWEB technology, the outsole promises an energized ride that stands up against wear and tear.

The minimalist structure of the Ultra Boost Laceless gives the foot a comfortable fit in a shoe that is true to size. Runners with a wide-volume foot might want to go half a size up to get an accommodating fit that is not too restricting. The shoe comes with a width of D – Medium for men.

The Continental™ rubber outsole aims to provide traction in both wet and dry conditions. Following the concept of automotive technology, the outsole is like a tire rubber that possesses more durability against natural wear-and-tear.

With the STRETCHWEB rubber on the outermost part, the impact of the foot strike is reduced, thus lowering damage and increasing performance. It also aims to handle various road surfaces that a runner may come across.

In the midfoot area lies the Torsion® system that functions as a platform to help prevent improper arch flexion, therefore resulting in a more stable ride. The purpose of the Torsion® system is to provide protection and control during strides and movements for a smooth heel-to-toe transition.

The laceless version of the Ultra Boost makes use of the boost™ technology, which Adidas touts as the most responsive cushioning unit in the market. It works on the notion that energy given will also result in energy received.

The boost™ cushioning system is made from the amalgamation of TPU capsules. This design enables the midsole to absorb energy and impact differently than standard EVA foams. The responsiveness of boost™ is comparable to a bouncing effect.

A sock liner is included to provide additional cushioning to the foot; it can be removed to allow the use of custom inserts.

Because the shoe does not have laces, the Primeknit upper works double-duty in providing comfort and support to the foot. Primeknit uses the concept of digital knitting to produce an exact level of flexibility and support, allowing the upper to wrap the foot seamlessly without restraining it.

There are several rows of ridges which are stiff and textured on the midfoot area where the shoelaces would be if there were any. The ridges act similarly to a rib cage: they protect the foot.

Instead of a tongue, there is a single-piece pull tab and heel collar that allows the foot to get the shoe on and off with minimal effort. It is made from a fabric material that is slightly padded to prevent abrasions and injuries.

The FITCOUNTER heel counter secures the foot to maintain a natural fit without causing too much pressure to specific areas like the Achilles.