Our slim fit is intended to follow the contours of the body Featuring Intraknit™ technology: Insulation, articulation, and ventilation are seamlessly integrated to help with movement and comfort during high-intensity activities. 100% Merino yarn provides the full power of Merino with moisture management, insulation, thermoregulation, and odor control. Insulating terry loops are seamlessly paired with mesh ventilation in gender-specific zones to help balance warmth and breathability. 3D mapping results in near custom fit and freedom of movement. 8.25" (21 cm) center-front zipper.