For a quarter-century, Filson's Jac shirt has been a true staple for pilots, sportsmen, ranchers, and craftsmen. This garment has a track record proven on the field, an incredible performance that ordinary shirts can only dream of. Thanks to the thick and heavy fabric, the Jac Shirt will keep you warm while ensuring the utmost comfort. The dense, thick texture is an excellent barrier against cold and wind, which makes the garment sturdy allowing it to last a long time.