Our flannel lined dungaree will keep him warm on chilly days. Made of 9-ounce, 100% cotton duck, with a 100% cotton plaid flannel lining, it features a full seat and thigh with an adjustable waist. It also has triple-stitched seams for durability, ruler pocket and double utility pockets. 3m-9m features a faux fly with back elastic and functional snap, 12m-24m features a functional fly with back elastic, and 2T-4T features a functional fly with adjustable waist. Available in sizes 3m-24m and 2T-4T.