Filson's heavyweight Mackinaw Jac-Shirt uses the same 100% virgin Mackinaw Wool that’s found on many of their jackets. It’s breathable, warm and naturally rain-repellent. A flannel lining in the body provides the softness of a shirt while adding even more insulation. The button front is easy to use while wearing gloves, and a pleated back allows a full range of motion.
Made with 100% virgin wool, which is breathable, naturally rain-repellent and very durable
Lined in soft, insulating cotton flannel
Handwarmer pockets are lined in flannel
Built for layering
Synthetic lining in sleeves for easy on/off over layers