Thermal wear refers to specialized clothing designed to retain body heat in cold conditions. It is typically made from materials that provide insulation while allowing moisture to escape, ensuring comfort during outdoor activities. Common examples include thermal tops, bottoms, and base layers that can be worn under regular clothing. These garments are essential for anyone engaging in winter sports or outdoor work, as they help maintain warmth without adding excessive bulk. Popular materials used in thermal wear include fleece, merino wool, and synthetic fibers, each offering unique benefits for different environments and activities.