creating a premier competition fit for executing rapid pivots

ensuring smooth and stable movement

0mm drop (24mm stack height)

Large rear mesh stash pocket for phone or nutrition gels

On Ultra Vest Pro Size:X-Small creating a premier competition fitThe next gen of On's pinnacle trail running vest! With a 10L dry pack and 2 500ml Hydrapak flasks for hydration. Optimized performance: Featuring improved bottle and pocket positioning for a better performance. A zip pocket at the front for easy access to your phone. And a new zip pocket at the back to safely store essentials, without bouncing or bunching. Athlete validated design: Tested and loved by elite trail athletes, this vest is up for every