This season we upped our game on the Heritage Flannels. We took it up on notch in weight and at 12.5 oz this special edition is our heaviest of flannels. For those in more temperate climes, this is a shirt jacket. For our friends up in Fargo, it's the real deal. A special "Z" twill construction of combed cotton yarns, this "3x1" twill of clear and pronounced plaids of heather yarns will remind you of the wool shirt jackets of the 1950's.