Jacques Mouflier, industrialist of the North of France, joins Charles Diebold and Nicolas Bazile, the mayor, in a common vision of the extraordinary potential of Val d'Isere. From then on the development of the resort accelerated considerably, the peasants of Val d'Isere became hoteliers, ski instructors, shopkeepers, the quality of skiing and the authenticity of the village, its reception, bear the reputation of Val d'Isere beyond the borders of the hexagon.
In 1942 Val d'Isere grew and counts... 242 inhabitants (today 1600, in the census of 2014). Once again it is through competition that the station will develop its notoriety. In 1947 Charles Diebold created the Spring Prize, which in a few years became a major sporting event. The Spring Prize will become the Critérium of the first snow in 1955, passing from spring to early winter (early December).