On Cloud X Review: Lightest, Fully-Cushioned Shoe For Running

On Cloud X Review
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On Cloud X Review: The World’s Lightest Fully-Cushioned Running Shoe for “Running Remixed”


The On Cloud X is marketed as the world’s lightest fully-cushioned shoe for “running remixed”. What is running remixed I hear you ask, I asked the same question at first as I wasn’t sure. It appears to be a term coined by On themselves, that refers to people who love to mix up their training but want to only have 1 pair of training shoes.

My definition of Running Remixed would be: running, training and racing in mixed environments across a range of different events/sports involving running. This means you can hit your goals wearing these shoes for trail running on light trails, road running, in the gym and even for triathlon training as they are comfortable to wear without socks, resulting in fast transitions.

Were you looking for one of these On shoe reviews?

Struggling to know where to start with On shoes, here is my definitive list of which On shoes I believe are the best for running.

Below are two videos that On have put together describing it their way, with beautiful visuals.

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Fit & Design

The On Cloud X shoes have a neutral fit, similar to the On Cloud if you’re familiar with them. When I first slipped them on, I was impressed at how comfortable they felt, even more so than the On Cloud, which in itself is impressive. When you combined this comfort with their minimal weight, they really feel like an extension of your foot.

Inner & Outer Meshes

On Cloud X Review
Stretchy mesh material that has an inner and outer layer

The new inner and outer mesh materials that On are using for the Cloud X really stand out to me as something innovative. They both stretch but the inner ‘sock liner’ is much softer than the outer, which negates the need for socks, should you prefer running in that style. The stretchy mesh is breathable and allows your feet to expand comfortably as they warm up during exercise. Feet can also shrink marginally during a workout or race, if external temperatures shift suddenly, so it’s important to have a running shoe that can accommodate these changes. The On Cloud X does this very well.

Heel Support

On Cloud X Review
Comfortable slim heel support

The heel support is sturdy yet slim in its construction and also very soft and comfortable to the touch.

The height of the ankle wall is just right for me allowing my ankles to fit snugly above while benefiting from their support!

Inner Sock

There’s a nice little sock which attaches the tongue to the forefoot area, similar to the On Cloudflow running shoes. This helps keep the forefoot snug within the shoe and stops the tongue from slipping out of place. As a result of this sock, I didn’t feel any discomfort caused by rubbing materials. All seams inside the shoe appear to be really well hidden, which also helps.

On Cloudflow Review 2019: On Shoes For Running Fast

The Tongue

On Cloud X Review

The tongue itself is very thin but also has a good amount of padding. Kudos On!

The Laces

On Cloud X Review
I’m loving these new laces

On have massively improved their laces for this shoe. In some of my other On running shoe reviews, you will learn that I’m not a fan of their slim, non-stretchy and most of the time overly long laces. These, on the other hand, are a perfect length and only require 1 tie for a secure knot. This is down to the stretchy fabric they are built with which is another design feature to allow your feet to expand and shrink comfortably over the course of a run. This whole experience makes for a much smoother ride that your feet will thank you for.

On Cloudrush vs Cloudflow: Which running shoes are best?

The Outsole

On Cloud X Review
The outsole is a thing of beauty with a lot of clever design work gone into it.

If you haven’t tried “Running On Clouds” before, you must! They somehow make you want to run faster. I always notice this, especially when putting on a new pair. The cloud pods give you that feeling of a cushioned landing, as they compress under your weight and forward force but also provide the feeling of a barefoot take off as the pods are compressed and then spring back at the time of your foot leaving the ground.

On Cloud X Review
The ‘clouds’ have had their inside edges sliced off, angling outward (stopping any stones from getting stuck)

Taking a closer look at the outsole reveals that the ‘clouds’ have had their inside edges sliced off, angling outward. This much-needed design tweak stops any small stones or debris getting caught in the pods, which used to be a problem shared amongst many.


The Cloud X has a heel to toe drop of 6mm, which is a recurring theme for most of their shoes. 6mm is a happy medium for runners moving towards a more minimal style of running, which I highly recommend.

On Cloud X Review
A look at the inside foot profile with its 6mm drop

Toe Box

I would say that the toe box area has a medium width. I have pretty average feet and they fit me really well. I’m guessing that the new stretch mesh will support almost any size feet anyway.

On Cloud X Review
Toe Box


The On Cloud X weighs in at 229g (US M 8.5) which is very light for a shoe with good cushioning. I really felt the benefits of having such a lightweight shoe after my long runs.

On Cloud X Review

on cloud x review - womens
On Cloud XWomen’s – $139.99

The On Cloud X comes in a large variety of men’s and women’s specific colours so be sure to check them out in the On-Running store. The colour scheme of the shoes In my review is called “Storm & Flash“. I love having the “flash” of orange on the shoe, it really spices up my running outfit. The colour of the Cloud X Women’s shoe, pictured to the left (above on mobile) is called “Red & Flash“. Pretty spicy hey!

Running in the On Cloud X

The On Cloud X are so comfortable for running on the roads and light trails. I haven’t tried any technical trails with them yet but if I do, I’ll update this post to share my thoughts with you. So far they have been very good for long and fast runs and I feel like I can push harder in my training sessions knowing that my feet won’t suffer for it. This, in turn, motivates me to want to run more often, which is so important during training blocks.

UPDATE 1/18/2019: I ended up running a 50km trail ultramarathon in these during the summer and they performed better than I thought they would! The trails were mostly forest and buffed. I still rate these as one of my favorite On shoes for running!

On Cloud X




Design & Function









  • Very lightweight (229g)
  • Very breathable dual mesh material
  • Many colours to choose from (men's and women's specific)
  • Great for multiple uses
  • This new outsole no longer picks up stones
  • springy cloud pods help your run faster


  • Tread could be more durable

In Summary

on cloud x review - mens
On Cloud XMen’s – $139.99

Maybe you enjoy mixing up your trail running with some road running, training at the gym or playing other sports. The On Cloud X will hold its own for all of them. I bet you notice a flurry of PBs when you start running in them too because the outsole transfers energy to forward motion so well!

On Cloud X – $139.99

You can purchase the On Cloud X running shoes for $139.99 from the On-Running Store.

Still not sure which On Running Shoes to buy?

Visit our Best On Running Shoes Guide for an ordered list of the top ON shoes for road and trail running. It has been designed to make your buying decisions easier.

The On Running Brand

Founded in Zurich, Switzerland from a revolutionary idea, a Swiss running shoe has evolved that is still amazing the sporting scene. The On provides a new running sensation and one that puts fun firmly centre-stage.

Check out our On Running brand page where you can see all of our content relating to the Swiss outdoor brand.

If you fancy learning more about their products, be sure to browse their online store.

If you have any questions about the shoes or anything relating to them then please leave a comment below and I will reply as soon as possible. Happy Trails (or roads in this case)!!

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