Thermal clothing is specially designed apparel that helps retain body heat in cold weather. Made from materials like fleece, wool, or synthetic fibers, these garments trap warm air close to the skin, providing insulation. They are often lightweight and breathable, making them suitable for various outdoor activities. Common types of thermal clothing include thermal tops, long johns, and socks. These items can be worn as base layers under regular clothing or as standalone pieces. By wearing thermal clothing, individuals can stay warm and comfortable during winter sports, hiking, or everyday activities in chilly conditions.