On Ultra Vest Pro Size:X-Small With a regular fit and

With a regular fit and a lightweight build so you can train without feeling weighed down and restricted

83% RECYCLED POLYESTER 17% SPANDEX

working together with the Dual Density midsole to provide your foot with optimum support

PWRRUN PB is Saucony’s premier cushioning material

With the perfect balance of softness

On Ultra Vest Pro Size:X-Small With a regular fit andThe 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