Crafted from soft yet durable brushed flannel made of 100% cotton and Thermogreen™ insulation at 80 g/m² from 100% recycled polyester, the Patagonia Lightweight Insulated Fjord Flannel Shirt keeps you warm with its timeless casual style. It features two button-down flap chest pockets, a button placket, adjustable cuffs, and a rounded hem.