About Down Proof Lining Fabric Down comforters, pillows, featherbeds; any article of bedding or clothing that is filled with down or feathers, requires a special fabric, a "Down Proof" fabric, sometimes referred to as "Ticking", that will help prevent the down and feathers from leaking. Proof fabrics that are filled with feathers or a blend of feathers and down need to be heavier and stronger...