This best selling Termo Original underwear is best suited for those who spend long periods outdoors, where physical activity is interspersed with inactivity at temperatures between -40°C and +5°C. The unique channel terry cloth material quickly wicks moisture away from the body and the longitudinal channels allow air to circulate to keep you warm. The long zipper helps you regulate your temperature. At extremely low temperatures we recommend using a combination of Termo Ultra and Termo Original thermal underwear. Special permanent odor control to keep you fresh and warm..