Surviving in a snowy forest when temperatures drop to -15°C requires not just knowledge but practical experience and preparation. One of the first things I've learned is the absolute necessity of proper insulation. Wearing multiple thermal layers that wick moisture away from your skin helps maintain body heat. Avoid cotton; instead, opt for wool or synthetic fabrics designed for cold weather. Shelter plays a critical role in winter bushcraft survival. Building a snow cave or a lean-to using branches and insulating materials like pine boughs can protect you from wind chill and retain warmth. When setting up camp, choosing a location that is sheltered from prevailing winds—such as near dense trees or natural formations—can make a significant difference. Hydration and nutrition are also vital. Snow can be melted for water, but eating snow directly lowers your core temperature. Using a portable stove or campfire to melt snow is essential. High-calorie foods rich in fats and proteins provide sustained energy to keep your body warm. Fire-starting skills are paramount. I carry waterproof fire starters and always gather dry tinder and kindling before the temperature drops. In extreme cold, fire not only provides warmth but also a means to purify water and cook meals. Navigating in snowy, forested terrain can be disorienting. Carrying a compass, map, or GPS device helps avoid getting lost. If you ever find yourself stranded, marking your trail and leaving visible signs can assist rescuers in locating you. Lastly, always inform someone of your plans and expected return time before venturing into harsh winter conditions. Preparation, knowledge, and respect for nature are your best tools for survival at -15°C in a snowy forest.