Filson's heavyweight Mackinaw Jac-Shirt uses the same 100% virgin Mackinaw Wool that’s found on many of our 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.

Features:

• 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
• 26-oz. Mackinaw Wool + 8-oz. cotton flannel lining