Aprons. Polyethylene – Apron resists liquids, grease and oils. Polypropylene – Protection from dirt and grime. Neoprene – Protection against chemicals and oils. Denim – Rugged. For use in warehouses, shop roo, stockroo. PVC – Thick, 18-mil. Protects from oils, fats and chemicals. Vinyl – Protection against grease and oils.