Product details top surface: 100% microfiber fabric sub-surface: 100% liquid-proof membrane covering side: 2.5 cm thick, with an elastic rubber that can stretch up to 45 cm, it grips the mattress from 4 corners. the duvet cover does not slip under it. the membrane surface in contact with the mattress surface makes your mattress successful. it not only protects the mattress in a way that protects it, but also prevents the formation of rustling, etc. sounds. it does not stain and does not create bad odor. it does not irritate and offers a comfortable comfort. it is ideal for people who have night sweating problems. it is useful for long-term patients. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.