Carhartt's Canvas Shirt Jac is flannel lined for extra warmth to get your through your coldest work days. Made of 9-ounce, 100% cotton canvas, it features a 4-ounce, 100% cotton flannel lining, antique-finish brass snaps and two chest pockets with rivet reinforcements. Main seams are triple-stitched for durability. * 9-ounce, 100% cotton canvas *4-ounce, 100% cotton flannel lining *Triple-stitched main seams