These are all virgin wool flannel "board shirts", by Pendleton woolen mills. They feature two flap pockets, straight bottom, button up, with a top loop button. Pendleton has made custom for Greenspan's this limited edition pattern, Space Dye. Reminiscent of wool and gaberdine dress shirts from a day gone bye. These are available, from size small to 3X In stock now. Regular fit. Pattern Space Dye