2 layers of soft breathable wool flannel serged with elastic at legs and waist. Side snaps give a great fit with good coverage over any diaper. Each cover has an extra set of snaps to be turned into a wool all-in-one by purchasing a snap-in diaper if desired. These work fabulous for night or day use yet are super trim!

Small fits 8-16lbs
Medium fits 14-26lbs
Large fits 24lbs+