I'm not a survival expert but I have walked and camped in sub zero temperatures in the Scottish Highlands so I do know a bit about common sense in low temperatures. The female character lost a glove but it didn't occur to her to put her bare hand in a pocket or double up with her remaining glove. The character that didn't jump appeared to be wearing an acrylic "woolly hat" which is not sufficient for sub zero temperatures, especially wet as it became later on, but for most of the film the hood on his jacket, which would have helped to keep his head warm, was down. The character that jumped leapt off the ski lift chair but if he had held onto the foot rest and dropped from there he would have fell 6 or 7 feet less and reduced his chance of serious injury. They were so dumb it was impossible for me to care if they died or not, in fact they deserved to die for being so dumb. Less dumb characters would have had some audience sympathy but not these three stooges.
