Thermal underwear is a type of clothing worn under regular clothing to provide insulation and warmth in cold weather. It is typically made from a moisture-wicking fabric that helps to keep the wearer dry and comfortable.
Thermal underwear is important for anyone who spends time in cold weather, whether for work, recreation, or travel. It can help to prevent hypothermia and other cold-related illnesses. Thermal underwear can also be beneficial for people who are sensitive to the cold or who have poor circulation.