The choice of demanding endurance runners, Salomon's Advance Skin 12 Hydration Running Vest offers more personalisation in both fit and function. An updated sensifit and closure system make this pack even more comfortable for your unique body shape, and the 12L volume offers enough space for longer endurance races. The Sensifit construction offers a snug, precise, comfortable fit and balances the load front and back, so you can move more freely and faster. The integrated soft flasks make it easy to drink as soon as you feel thirsty, and stays balanced when you run, so you can push the limit and stay hydrated. The components of this pack are easy to use, and offer different ways to adjust the fit and carry poles and accessories. Advance Skin 12 Hydration Running Vest