The Combin de Valsorey is a rocky Alpine peak that stands nearly 4,200 metres above sea level near the Swiss-Italian border. Its north-west face rises 670 metres, at a gradient of about 50 degrees, steep enough that you can stand on the slope and touch the higher ground beside you without bending down.
In May 2016, when Jérémie Heitz climbed the Combin for the first time, the north-west face of the mountain looked like a vertical curtain of white, fringed by bands of dark rock. In several places, smears of greyish ice darkened the snow cover. Heitz’s ascent was nothing extraordinary in mountaineering terms: this face was first ascended in 1958, by Egbert Eigher and Erich Vanis. But Heitz was not climbing the Combin because he cared about going up – his plan was to ski down it.
