What is the name of The North Face's trail running series?

The North Face’s trail-running series is called the Endurance Challenge.

The North Face Endurance Challenge was a series of trail and ultramarathon events designed around long-distance racing on challenging natural terrain. Events featured multiple distances so runners could enter races ranging from shorter trail courses to demanding 50-mile and 50-kilometer competitions.

The series became associated with major U.S. trail-running destinations, including races in California and New York. It also helped The North Face connect its equipment and athlete sponsorship work with the growing ultramarathon community.

“Endurance Challenge” is sometimes confused with a single race or with generic endurance-training programs. In The North Face context, it is the name of the branded race series. Individual events may have different distances, locations and course profiles, but share the Endurance Challenge identity.