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On Running Size and Fit guide

Brand & fit at a glance

Size system
EU
Fit
True to size
Origin
Switzerland
Best for
Running and everyday wear
Children’s Women’s Men’s

About On Running: On is a Swiss running footwear brand founded in Zurich in 2010 by Olivier Bernhard, David Allemann and Caspar Coppetti. Its hallmark is CloudTec® cushioning, a sole made up of hollow pods that compress on landing and firm up for push-off. On began as a performance running brand and has since added lifestyle trainers and trail models to the range. We stock their road and everyday styles for children, women and men.

On Running fit & sizing tips

  • True to size. On Running shoes are sized true to size for most feet, in UK sizing.
  • Snug through the midfoot. Many On uppers hold the foot more closely than a traditional trainer, so try your usual size before sizing up.
  • Allow a short break-in. CloudTec pods can feel firm at first and usually settle after a few outings once the shoes have been worn in.
  • Our take. A strong choice for road running and everyday wear if you like a responsive feel underfoot, though the max-cushion models such as Cloudmonster are a different proposition.

On Children’s Shoes

On children’s trainers are made in EU sizes and come up true to size, with the same light, cushioned CloudTec sole as the adult range. Measure your child’s foot and allow about a thumb’s width of growing room at the toe. We stock from EU 28 (UK 10) to EU 39 (UK 6).

On Running children’s shoes size conversion
UK (site) EU UK (box) Foot cm Approx. age Shop
10 28 10 16.7 4.5 yrs
11 29 11 17.6 5 yrs
12 30 12 18.4 5–6 yrs
13 32 13.5 19.7 6–7 yrs
1 33 1 20.1 7–8 yrs
3 36 3.5 22.0 10–11 yrs
5 38 5 23.3 12–13 yrs
6 39 6 24.1 13–14 yrs

On Women’s Shoes

On women’s trainers are made in EU sizes and generally come up true to size, with a fairly snug, locked-in fit through the midfoot. If you have a wider foot or are between sizes, the half size up is usually the better choice. We stock from EU 37 (UK 4) to EU 42 (UK 8).

On Running women’s shoes size conversion
UK (site) EU UK (box) Foot cm Shop
4 37 4 23.3
5 38 5 24.0
5.5 38.5 5.5 24.3
6 39 6 24.7
7 41 7 26.3
8 42 8 26.7

On Men’s Shoes

On men’s trainers are made in EU sizes and generally come up true to size, with a fairly snug, locked-in fit through the midfoot. If you have a wider foot or are between sizes, the half size up is usually the better choice. We stock from EU 41 (UK 7) up to EU 48.5 (UK 13.5).

On Running men’s shoes size conversion
UK (site) EU UK (box) Foot cm Shop
7 41 7 26.3
8 42 8 26.7
9 43 9 27.3
10 45 10 28.7
11 46 11 29.3
12 47 12 30.0
13.5 48.5 13.5 31.0

Glossary

CloudTec®

On’s patented sole technology made up of hollow cushioning pods that compress on landing and firm up for push-off.

Speedboard®

A stiff internal plate that runs through the sole to store and release energy with each stride.

Engineered knit upper

A lightweight, breathable upper used across much of the range that flexes with the foot and holds it securely.

Frequently Asked Questions

Do On Running shoes run true to size?

We find On generally true to size in UK, which matches the brand’s own guidance. The fit is often described as snug rather than short, so if you are between sizes or prefer a roomier feel, a half size up is worth trying.

Are On Running shoes good for wide feet?

Most On models are a standard width and hold the foot fairly closely through the midfoot. If you have a wider foot, we would try your usual size first on roomier styles such as Cloudrunner, or look for a wide-fit version where On offers one.

Should I size up in waterproof On shoes?

Yes, we would usually go up half a size in On’s waterproof range. The membrane upper has less give than standard mesh or knit, so the extra room makes a noticeable difference.

Can I wear On running shoes for walking and everyday use?

Yes. On themselves say their running shoes work well for walking, and many of our customers wear Cloud lifestyle models for travel and all-day comfort. For serious road running, match the model to your mileage and cushioning preference.

How should I clean On Running shoes?

Hand wash only with lukewarm water and a mild detergent, then air dry at room temperature away from direct heat. On advise against machine washing or tumble drying, as the heat and agitation can damage the CloudTec pods and the bonding.

Why do On shoes feel firm or snug at first?

On trainers are designed to hold the foot securely, and the CloudTec pods can feel firm until the shoes have been worn in over a few outings. That snug midfoot feel is normal on many models and is not the same as the shoe being too short.

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FAQs
Size system: EU
Fit: true to size
Location: Switzerland
Size charts: Ladies’ size chart Men’s size chart

About On Running: On Running is a Swiss athletic footwear brand that burst onto the scene in 2010, founded by former Ironman champion Olivier Bernhard, alongside David Allemann and Caspar Coppetti. The brand quickly gained acclaim for its innovative CloudTec® cushioning technology, which provides a unique running experience that feels akin to "running on clouds." This technology features individual cushioning chambers that absorb impact and adapt to a runner's style, making it a favourite among athletes and casual wearers alike. Over the years, On has expanded its offerings beyond traditional running shoes to include lifestyle and outdoor footwear, all while maintaining a commitment to sustainability through the use of recycled materials and eco-friendly practices. With endorsements from high-profile athletes like Roger Federer, On Running has established itself as a prominent player in the global sportswear market, appealing to both performance-driven individuals and fashion-conscious consumers.

 

On Running Ladies’ shoes

On Running ladies' shoes typically fit true to size, but there are a few nuances to consider. Many users have reported that the shoes offer a snug fit, particularly in the toe box, which can be beneficial for those with narrower feet. However, if you have wider feet or prefer a bit more room, it might be wise to consider going up half a size or exploring the brand's wide-fit options.

On Running ladies' size conversion guide
On Running UK Size 3 3.5 4 4.5 5 5.5 6 6.5 7.5 8 8.5 9 9.5 10 11 11.5 12 12.5 13 13.5
EU 36 36.5 37 37.5 38 38.5 39 40 41.5 42 42.5 43 44 45 46 46.5 47 47.5 48 48.5
CM 22.7 23 23.3 23.6 24.0 24.3 24.7 25.3 26.0 26.7 27 27.3 28.0 28.7 29.3 29.6 30.0 30.3 30.7 31
US 5 5.5 6 6.5 7 7.5 8 8.5 9.5 10 10.5 11 11.5 12 13 13.5 14 14.5 15 15.5


On Running Men’s shoes

On Running men's shoes are generally known to fit true to size, aligning well with most major running shoe brands like Saucony and Brooks. However, certain models may vary slightly in fit. For instance, the On Cloud and Cloudswift often run a half size smaller, while the Cloud X tends to fit true to size. Runners with wider feet might find it beneficial to size up, especially in models designed for a snugger fit. To ensure the best fit, measuring your foot in our shop and consulting the sizing chart is always a wise approach.

On Running men's size conversion guide
On Running UK Size 3 3.5 4 4.5 5 5.5 6 6.5 7.5 8 8.5 9 9.5 10 11 11.5 12 12.5 13 13.5
EU 36 36.5 37 37.5 38 38.5 39 40 41.5 42 42.5 43 44 45 46 46.5 47 47.5 48 48.5
CM 22.7 23 23.3 23.6 24.0 24.3 24.7 25.3 26.0 26.7 27 27.3 28.0 28.7 29.3 29.6 30.0 30.3 30.7 31
US 5 5.5 6 6.5 7 7.5 8 8.5 9.5 10 10.5 11 11.5 12 13 13.5 14 14.5 15 15.5


On Running Shoe Care Guide

Looking after your On Running shoes is essential to prolong their lifespan and maintain their performance. Here are some key tips to keep them in tip-top condition:

  • Regular Cleaning:
    After each run, gently remove loose dirt by clapping the shoes together or using a soft brush. For deeper cleaning, hand wash them using a mild detergent mixed with warm water. Avoid the washing machine, as the heat and agitation can damage the shoe's structure.
  • Remove Laces and Insoles:
    Take out the laces and insoles before cleaning. You can wash these separately by hand or, if they're machine-safe, in the washing machine. This helps ensure a thorough clean without damaging the shoe itself.
  • Air Dry:
    After cleaning, allow your shoes to air dry at room temperature. Avoid direct heat sources like radiators, as they can warp the materials. Stuffing the shoes with scrunched-up paper can help absorb moisture and maintain their shape.
  • Proper Storage:
    Store your shoes in a cool, dry place, ideally with the laces undone and the insoles removed. This prevents moisture build-up and helps maintain their shape.
  • Rotate Your Shoes:
    If you have multiple pairs, rotating them can help distribute wear and tear evenly, extending the life of each pair.
  • Protective Sprays:
    Consider using a water-repellent spray before wet weather to protect the materials from moisture damage.

Glossary

Term Description
CloudTec®An innovative cushioning system that absorbs impact and adapts to a runner's movements, providing a sensation akin to "running on clouds."
Speedboard®A flexible plastic layer that sits between the midsole and upper, designed to enhance propulsion and support during toe-off, making each step more responsive.
Helion™ SuperfoamA lightweight foam that offers excellent cushioning and energy return, ensuring a comfortable ride while maintaining durability.
Missiongrip™A specially designed outsole rubber that provides superior traction on various surfaces, ensuring stability and grip during runs.
Zonal Knit UpperA breathable and adaptive upper construction that offers a snug fit while allowing for flexibility and ventilation.
Dual-Foam SetupA combination of different foam densities in the midsole, providing a balance of cushioning and stability for a dynamic running experience.
LightSpray™A lightweight material used in the shoe's construction, contributing to overall comfort without compromising support.
Adaptive FitA design feature that allows the shoe to conform to the unique shape of the foot, enhancing comfort and reducing the risk of blisters.
Torsional RigidityA measure of how well the shoe resists twisting, providing stability and support during lateral movements.
DropThe difference in height between the heel and toe of the shoe, affecting the running posture and feel; On shoes often feature a moderate drop for a balanced experience.

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