The surface is mainly wide trails combines with narrower forest trails (12%), dirt roads (11%) and some stretches of asphalt (23% of which it is possible to run on softer surface next to the asphalt on half of this). The forest trails have roots and stones but apart from this the surface is not technical. Normal running shoes should be sufficient. There are some small hills but in general the course can be considered as fairly easy to run. The total elevation gain during the 100 miles is 1500 meters. The course will be well marked during the race. A detailed description of the course will be posted on the website well before the race. The snow and ice should have disapeared at the time of the race, but in case spring is late be prepared for short patches of ice and snow. The course will be altered if the snow/ice conditions necessitates it.