The Hanes Women's X-Temp Thermal Underwear Set is a popular choice among Amazon shoppers. Made from a blend of polyester and spandex, this ribbed base layer set is designed to adapt to your body temperature, keeping you warm when it's cold and cool when it's hot. The top features a crew neck and long sleeves, while the bottoms have an elastic waistband for a secure fit. Whether you're engaging in outdoor activities or simply lounging at home, this base layer set will provide the comfort and versatility you need.