Devold Duo Active underwear combines fine organic merino wool on the outside and ThermoLite on the inside to provide the best possible comfort on cold winter days. ThermoLite is made from 100% recycled material and is a high-quality functional fiber that ensures optimal moisture transport. The merino wool on the outside has excellent insulating properties and ensures that you stay warm even when wet. The Duo Active base layer is a bestseller because of its comfort and because the fiber combination makes it one of the best base layers to wear for winter outdoor activities. - Wide and comfortable elastic waistband - Flat seams for optimal comfort. - Gusset for a flattering fit. - Lining made from 100% recycled material for extra comfort for wool-sensitive skin. - Machine washable and tumble dryable (Total Easy Care merino wool).