Mackinaw Wool Jac ShirtThe Mackinaw Wool Jac Shirt pulls double duty: light enough to wear like a shirt, tough enough to insulate like a coat. Its dense weave blocks wind, sheds weather, and holds warmth even when wet. The wool naturally wicks away sweat and moisture, keeping you dry mile after mile. Flapped chest pockets with hidden buttons stay clear of straps and gear. It's a layer that feels at home chopping wood, hauling gear, or just walking into town on a cold night.