It has 100% Liquid Proof feature. Upper Surface: 100% Cotton Fabric Lower Surface: 100% Liquid Proof Membrane Coating Edge: 2.5 cm thick, elastic four-corner elastic that can stretch up to 45 cm. Thanks to its cotton feature, it keeps you cool in hot weather. It keeps you warm in cold weather in winter. It does not slip under the duvet cover. The membrane surface in contact with the mattress surface not only protects your mattress successfully but also prevents the formation of rustling and similar sounds. It does not stain and does not create bad odours. Thanks to the micro pores that provide the air circulation needed by the skin, it allows you to extend the life of your mattress without compromising comfort. It has air permeability thanks to its micro pores - it breathes but does not leak liquid. It does not irritate the skin - provides comfortable comfort. It is ideal for people who have night sweating problems. It is useful for long-term hospitalized patients. Washing Instruction: Do not bleach etc. Chemical substances should not be used. It can be washed up to 60 degrees. Do not dry clean or iron. Important Information: Our products are produced in Denizli city. You will have the advantage because we have our own manufacturing. Before ordering, be sure to measure your bed and place your order. Our products are exactly the same size. You don't need to order a larger size to worry about shrinkage.