Features of the Smartwool Intraknit Thermal Balaclava 100% Merino yarn provides the full power of Merino with unparalleled moisture management, Insulation, thermoregulation, and odor control Engineered construction Uses knit structures to enhance Performance with a sophisticated finish Insulating terry loops Are seamlessly paired with mesh ventilation designed to balance warmth and breathability Mesh mouth panel for added breathability Knit-in reflective elements enhance visibility in low light conditions Fabric Details 100% Merino Wool