With its completely liquid-impermeable structure, sweat-water-blood-urine etc. It prevents liquids from damaging your mattress. Upper surface: Special Microfiber Fabric with Quilted Stitching. Research the advantages of microfiber fabric. High air permeability - protects against the formation of dust mites and other allergens. Surface Touching the Bed: 100% Membrane Covering (A Material That Does Not Impermeable to Liquid, Giving the Feel of Artificial Leather) Side Surface: Combed cotton fitted sheet covering - it covers all four sides of the bed. For microfiber products, you can type YSTK79 and search. Thanks to its quality membrane structure, no rustling etc. Doesn't make sounds. It does not stain and does not cause odor. It is ideal for people who have night sweating problems. It is useful for long-term hospitalized patients. It can be used for children and adults with bedwetting problems. For the correct result, you should measure your mattress and choose the size according to its exact dimensions. Washing Instructions: Do not use bleach or similar chemicals. Wash only with laundry detergent. It can be washed in the washing machine with plenty of water. Do not dry clean. Do not use bleach or bleach. Ironing should not be done. Do not put it in the dryer.