Upholstered furniture varies, from commercial upholstery to marine upholstery. Marine upholstery is different as it should take into account dampness, hard usage and sunlight. Besides these, each screw and staple must be of stainless steel. Any wood used must be of marine quality. Nylon zippers and Dacron thread are used for sewing while marine upholstery foam with a thin film of plastic is used to keep the water out. Hence, marine upholstery must use materials that are of quality.