Specially developed for long-distance runners, the ULTRA VEST 10L from On Running is a highly effective trail waistcoat that has been tested by professionals.

With a capacity of 10 litres, this high-performance model has been designed, tested and approved by trail athletes, and benefits from a high-quality design. Optimised for stability, it has a functional, modular design, while its ultra-light, robust breathable mesh fabric is discreet. What's more, it features a patent-pending fastening system and an adjustable hem, allowing you to adjust the fit of the waistcoat.

This waistcoat has been carefully finished with non-stretch materials that minimise the bounce of the water bottle for maximum comfort during exercise, a hydration system with two flasks and a water pocket included, and a removable 5-litre waterproof pouch.