Since 1985, UD has been developing hydration packs for (trail) running and other outdoor activities. From the very beginning, UD has been a leader in hip packs with water bottles. Today, 30 years later, UD is the market leader in (trail) vests in America.

All UD products are developed by and for athletes. Some of the world's best (trail) runners are involved in the development of the bags. A lot of time is spent testing with the athletes, resulting in excellent equipment for the most extreme conditions.

UD was the first brand to come up with a specific Women The Jenny collection, a trail running vest, was introduced. UD also offers the Scott Jurek and Anton Krupicka vests.