What’s even heftier and warmer than our epically hearty Free Swingin’ Flannel Shirt? Our Free Swingin’ Flannel Shirt Jac. We started with our famously weighty 5.6-oz. 100% cotton flannel, then added 80 grams of lightweight, bulk-free insulation for even more heat-holding power. Stitched in a smooth taffeta lining that slides on without hanging up. And built in all the work-friendly features you expect from Duluth, including easy-moving Reach Gussets™ and 7 functional pockets. In other words, it’s totally jac’d!