The Cosmiques Route is a well-known alpine route on Mont Blanc du Tacul and is more technical than the normal snow route. It typically combines steep snow, ice, and short mixed sections, with conditions strongly dependent on the season. The line is exposed to rockfall and serac-related hazards in the lower and middle sections. It is a popular objective for climbers seeking a more demanding ascent from the Aiguille du Midi area. The route requires solid cramponing and ice-axe technique, and often protection on mixed terrain. It is usually climbed in good conditions and with an early start.