From Patagonia

Made from soft yet durable 100% Cotton in Conversion brushed flannel with 80-g Thermogreen 100% recycled polyester insulation, the Lightweight Insulated Fjord Flannel Shirt keeps you warm in casual, timeless style. Made in a Fair Trade Certified factory.

• Body fabric is made from 100% Cotton in Conversion brushed flannel; the smooth lining is 100% recycled polyester taffeta with a durable water repellent (DWR) finish made without intentionally added PFAS
• Insulated with toasty 80-g Thermogreen 100% recycled polyester
• Two chest pockets with button-closure flaps keep your valuables secure; two side-entry handwarmer pockets help get your fingers working again in cold weather
• Full-length, button-front placket provides easy adjustability to accommodate changing conditions
• Cuffs can be worn buttoned in the cold or unbuttoned to allow for easy sleeve rollup in warmer weather
• Made with a shirttail hem to go with most everything and everywhere, from casual hangouts to commuting to work or school
• Made in a Fair Trade Certified factory, which means the people who made this product earned a premium for their labor