The Finnish troops were known for the ability to ski and move fast on skis from one place to another during the Winter War, but that didn't require any type of downhill skiing as shown in the film. Instead, the Finnish soldier was a proficient cross-country skier, since Finland lacks any mountainous terrain (see Errors in geography).
The real Finnish landscape does not feature big mountains as shown in the film. Also the traditional costumes look more like Tirolian than Finnish.