The On Running Ultra Vest Pro is a lightweight trail running hydration vest designed for long training runs, ultras, and race-day performance.

Constructed with breathable mesh and a secure, no-bounce fit, it moves comfortably with the body over technical terrain. Two 500 ml Hydrapak® soft flasks are included for easy access hydration, while multiple stretch and zip pockets provide organised storage for nutrition, phone, and essential gear. A removable, seam-sealed dry pack with a water-resistant zip adds protected storage for extra layers, and reflective details with an integrated safety whistle round out a highly functional vest built for endurance efforts.

• 100% Recycled polyester
• Back panel & pockets: 85% polyamide, 15% elastane
• Toggle closure system
• Emergency whistle
• Dual front pockets for flasks
• 2x 500ml Hydrapak soft flasks included
• Stash pockets
• Front & rear zip pockets
• Reflective accents
• Removable seam-sealed dry pack w/ water resistant zipper
• SKU: 2UF30130069