Mackinaw Wool Shirt Jacket - GreenThis Mackinaw Wool Shirt Jacket from Filson is made from heavyweight, virgin Mackinaw wool thats breathable, warm, and naturally rain repellent to keep you nice and comfortable through even the worst weather. Its tailored with a roomy, relaxed fit thats made to layer with and is finished with a woven seasonal plaid pattern, a full front button closure, and a pair of chest pockets with concealed button closures that wont get hung up on straps or gear.