A winter sleeping bag is designed to provide warmth and comfort during cold weather camping or outdoor activities. These bags are typically insulated with materials like down or synthetic fibers, which trap heat and keep the user warm even in freezing temperatures. They often feature a draft collar and hood to minimize heat loss. Winter sleeping bags come in various shapes, such as mummy or rectangular, and are rated for specific temperature ranges. When choosing a sleeping bag, it's essential to consider factors like insulation type, weight, and packability to ensure it meets your needs for winter adventures.