The trailhead must be reasonably accessible, the elevation gains not excessive. Water must be available each day. And the selections must offer good geographical balance. Participants earn their place in hiking history with a listing in the permanent HGS Register. An official Certificate of Acheivement and special Grand Slam T-shirts are also available.
Fees go to help trail maintenance, signs, and preservation of the trail hiked.
The Circular Route arond the Vanoise Glacier, French Alps.