When every second counts, comfort and convenience make all the difference. Over ultra distances, quick and easy access to your essentials can make incremental gains that add up to a sizeable advantage. Designed and fine-tuned for demanding endurance races and runners, ADV SKIN 12 ensures on-the-go access to hydration, long-distance comfort and freedom of movement. This 12L version has an ultra versatile storage unit and is ideal for longer distance races and adventures.