Canada Goose's knitwear is designed to perform well. Spun from naturally insulating merino wool, this 'Dartmouth' sweater is reinforced with CORDURA® in high-stress areas and made using Thermal Mapping® technology, meaning it has breathable open-knit panels in areas prone to overheating, like the upper back, under the arms and along the sides. *too small for my husband. Too late to return.