The Patagonia M's LW Insulated Fjord Flannel Shirt features a high quality flannel made from cotton in conversion cotton and stands out with an exquisite 80 grams per square meter Thermogreen insulation made from recycled polyester. For added comfort, there are two usable chest pockets and hand warmer pockets. This shirt is sustainably produced in a Fair Trade Certified factory and thus contributes to conscious consumer behavior. The full-length button placket and adjustable sleeves are customization options that can respond to changing conditions. An all-round convincing piece of functional clothing.