The Packer is made with our Mackinaw Wool, a densely woven twill from sheep raised in regions with wide temperature swings. These sheep develop a fleece that can protect them year-round in hot and cold weather, which is precisely why their wool does such a great job of protecting people. The uncommonly tight weave creates a barrier to wind and water while maintaining outstanding breathability. The flannel lining is made from the same fabric used in our mainstay shirt trusted by sportsmen, tradesmen and Alaskan bush Pilots for 25 years. The natural sheepskin-shearling collar can be turned up and latched at the throat, creating a warm and comfortable barrier against freezing wind and snow that extends to ear-height. Material 24-oz./LY 100% Mackinaw Wool + 8-oz. 100% cotton flannel + polyester twill + New Zealand/Australian sheepskin shearling Size Guide (In Inches) Length 33 Chest 44 ¼ Sleeve 34 ¼ Excellent Condition No tear, no stain, no odor