ON Footwear - Size Guide
| US | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13 | 14 |
| EU | 40 | 40.5 | 41 | 42 | 42.5 | 43 | 44 | 44.5 | 45 | 46 | 47 | 47.5 | 48 | 49 |
| UK | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13.5 |
| US | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 |
| EU | 36 | 36.5 | 37 | 37.5 | 38 | 38.5 | 39 | 40 | 40.5 | 41 | 42 | 42.5 | 43 |
| UK | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 |
Overview
ON Cloudultra 3 Mens Trail Running Shoes
Built for ultra-distance races on technical terrain. Featuring a CloudTec® cushioning system for stability and efficiency, and Helion™ HF hyper foam for energy return and impact absorption, this shoe offers control over long distances.
Product Highlights
Go The Distance
Everything about the Cloudultra 3 is optimized for ultra long distances on technical terrain. From the cushioning and secure fit to the breathable and abrasion-resistant upper, it’s built for those that want to run further.
Stability and Control
The CloudTec® cushioning system is engineered for technical efficiency, featuring dual-density Helion™ HF hyper foam for balanced energy return and impact absorption. A nylon Speedboard® enhances stability and support, providing smooth transitions and underfoot protection. Built for comfort and control over long distances on rugged terrain.
Advanced Grip
Meet our most advanced grip – ever. Featuring an updated Missiongrip™ outsole with a new lug profile developed with FEA (Finite Element Analysis). For unparalleled grip and traction.

Product Features
- On mens trail running shoes
- Mid Cushioning
- For Technical Terrain
- Heel to toe drop: 6mm
- Weight: 295g
- CloudTec® cushioning system engineered for stable runs
- Dual-density Helion™ HF hyper foam for energy return on technical terrains
- Nylon Speedboard® for stable movement
- Missiongrip™ outsole for traction on mixed terrain
- Durable upper for added protection on rugged terrain
- Secure, technical fit
- Upper Unit: recycled polyester, TPU / Bottom Unit: Speedboard: Nylon 6 / Technology: CloudTec
- Colour: Iceberg | Glacier
- Style Code: 3MF30234788
delivery & returns
FREE STANDARD DELIVERY WITHIN REPUBLIC OF IRELAND OVER €70
Delivery to any Intersport Elverys store is free for all standard orders.
Free standard home delivery to anywhere in the Republic of Ireland for all standard orders over €70.
Delivery Service (without assembly) to the Republic of Ireland for Home Gym equipment costs €20, select items incur a delivery charge of €40 due to oversized dimensions. Click here for more information about our delivery charges.
Standard delivery to Republic of Ireland at present is taking 1 to 4 working days.
If your order does not meet these timings, it may be because your item(s) are being dispatched from a different location. In this case, we will contact you with an expected delivery date.
For more information on our standard, UK and international delivery times and costs please click here.
EXTENDED RETURNS
Purchases made from Monday October 13th 2025 can be returned up until Sunday January 25th 2026. Our standard 30-day policy resumes on December 27th 2025.
FREE RETURNS TO STORES
If you’re unhappy with your purchase, we’re happy to offer a refund on unused, re-saleable items returned with original packaging within 30 days of receipt of your order. You can return your item to us with your Order Reference Number and this Returns Form completed, or alternatively you can bring to any of our stores.
FREE RETURNS to any of our Stores**
Returns to our stores are completely FREE! You’ll need to take your Order Confirmation Email, or your Order Reference Number, or the Delivery Docket, and the credit/debit card used to pay for the order (if applicable). Please check on www.elverys.ie for our store locations and opening times.
Returns via Post
You can post your item back to our Distribution Centre. Fill in the Returns Form supplied with your order (or download here) or enclose a note detailing your name, address, contact number, Order Reference number and reason for return. For full information on our returns policy and what you need to obtain a refund please click here.
Returns for orders fulfilled and shipped from our Partner Warehouses**
Please note, items fulfilled and shipped by a Partner Warehouse, (including orders for Portwest workwear range), cannot be returned to an Intersport Elverys store. While returns to stores are possible where applicable, we recommend sending them directly to our Head Office.
Please fill in the Returns Form (download here) for a quicker resolution. For a full refund, the item(s) should be returned in its original condition with proof of purchase within 30 days of receipt of the order. If you have any queries on returns, please contact our Customer Service team.





