Ultra Vest Pro Fog｜ Outerwear

On Vest Pro - Elite trail running vest for serious distance
On's premium trail running vest delivers professional-grade performance with integrated hydration and versatile storage. Featuring two 500ml Hydrapak® flasks and a detachable 10-litre dry pack, this athlete-tested vest handles everything from fast training runs to ultra-distance races.
 
 
Engineered for Zero Bounce
An innovative closure system locks the vest securely against your body, eliminating movement even on technical terrain. Improved bottle and pocket positioning distributes weight strategically, maintaining balance as you drain flasks or access nutrition. At 300g, it's light enough to forget you're wearing it, yet robust enough for demanding conditions with reinforced construction in high-strain areas.
 
 
Intelligent Storage Solutions
A front zip pocket provides quick phone access without breaking stride, whilst a rear zip pocket securely stores essentials away from your back. Large side pockets accommodate gels, bars, and layers within easy reach. The removable seam-taped dry pack with water-resistant zipper keeps spare kit or mandatory race gear protected, and additional daisy loops allow modular attachment for accessories like On's Ultra Quiver.
 
 
Complete Hydration System
Two BPA-free Hydrapak® 500ml flasks come included, positioned for natural access whilst running. The bottles sit securely in their pockets without requiring constant adjustment, allowing you to maintain focus on the trail ahead. A safety whistle provides peace of mind on remote routes.
 
 
Key features:
- Two 500ml Hydrapak® BPA-free flasks included
- Detachable 10-litre seam-taped dry pack
- Innovative no-bounce closure system
- Front zip pocket for phone access
- Rear zip pocket for secure storage
- Large side pockets for nutrition
- Reinforced high-strain areas
- Safety whistle
- Daisy loops for modular attachments
- Water-resistant zipper on dry pack
- Weight: 300g
 
 
Best for:
- Ultra marathon racing
- Long-distance trail training
- Technical mountain running
- Self-supported adventures
- Races requiring mandatory kit
- Multi-hour trail efforts
- Athletes needing zero-bounce performance
 
 
Is the Vest Pro right for you?
If you're running ultras, training for long trail races, or regularly covering substantial distances where carrying gear matters, this vest merits serious consideration. The athlete-validated design suits runners who've experienced bounce issues with other vests and need reliable performance on technical terrain. The 10-litre capacity works well for self-supported long runs, races requiring mandatory kit, or fast-and-light approaches where you want options without excess bulk. Whether you're racing mountain ultras, training in remote areas, or tackling multi-hour trail efforts where hydration and gear management are crucial, the Vest Pro provides the stability, storage, and durability that serious trail running demands.
 
 
Sizing guide:
S: 87-93cm chest
M: 94-100cm chest
L: 101-107cm chest
Measure around the chest horizontally at the widest point
Brand:OnCategory:AccessoriesSKU:2UF30134353Tags:Accessories, Bags, Beige, Colour: Beige, non-sale, On, Ultra PacksAccessories Size:Small, Medium, Large