Nobody in his right mind would climb snow-covered mountains improperly dressed--no overcoat, no boots, no gloves, no scarf, no ear-covering hat, etc.--yet near the climax of the film, Janssen and other cast members risk frostbite and possibly even hypothermia by wearing only basic, non-protective clothing. Presumably, for outdoor films of this type, directors prefer not to swaddle their stars, perhaps for fear of potentially making them less quickly identifiable to the viewer. Either that, or certain "outdoor" scenes are in fact filmed indoors on sound stages.