50 years ago, Filson introduced the original Jac-Shirt — a hybrid between a coat and a button-up flannel. Since then the Jac-Shirt has become an indispensable piece of outdoor wear, now reaching its pinnacle with ultra-warm Mackinaw wool. The wool wicks moisture to the outside of the shirt, keeping it warm and dry. The two front pockets feature hidden buttons to prevent snags on branches or equipment and adjustable cuffs keep hands free when you need it. Sewn at Filson, this is an heirloom-quality shirt.