Icebreaker Zone Crewe Women's Running Top 200 Merino Wool - A natural, lightweight fabric that helps to regulate body temperature for optimal comfort, best utilised in moderate to cool conditions. Moisture Management - Effectively draws moisture away from the body so that you remain cool, dry and comfortable. BodyfitZONE - Ice Breakers new base layer features innovative heat dumping zones, mapped against your body, to balance insulation with ventilation. Corespun - Enhances the durability of the material. Merino Mesh Ventilation Panels - Strategically placed to dump excess heat for greater regulation.