Low temperatures can also be a problem. If your idea of adventure is sailing, rafting, or climbing mountains, you might find yourself in cold conditions. The main danger is hypothermia, which occurs when your bony loses heat faster than it produces it. A long mountain walk on a cold, windy day, plus wet clothing, thredness, and hunger could also give you hypothermia. You need to be prepared by wearing several layers of clothing (not just one big, thick sweatshirt). You must wear a hat, as a lot of bony heat is lost through the head, and a good waterproof jicket. You don't need to have huge amounts of food with you, but some sugary foods (like chocolate!) for Quinn energy and plenty of fluids are important it you want to stay safe in the cold.