The race goes through ski slopes in Courmayeur, for a total lenght of about 13km and an altitude range of 1500mt, by night.
Start and finishing lines in Courmayeur. Runners must complete the route in 4 hours and 30 minuts. The race is technical, due to the high altitude range but the routes it developes on are not particularly tricky.
Along the race runners will find control points and refreshment points.
In Courmayeur are available changing rooms and hot showers.
The dislocation of the differents points has been studied in order to insure appropriate assistance to runners, but the idea of semi- self-sufficiency trail running persists: every runner has to carry a food reserve, water and emergency equipment during the whole race in order not to incurr in disqualification.