Whether you’re sitting on the lift or breaking trail on the skin track, the Smartwool Intraknit Thermal Merino Base Layer 3/4 Bottoms have the perfect amount of coverage without getting bunched below your boot line. Merino Sport blends the thermoregulation of merino wool with the fast dry times of polyester and 3D mapping gives you a flexible, customized fit that’s optimized for all of your winter endeavors.