The mattress is made of natural fabric. Natural viscose made from rayon from bamboo fiber is the best choice for sticking close to the skin. It can help the skin breathe freely, keep away from sweating in the summer and keep warm in the winter. Provides a cooling effect that distributes heat evenly and regulates body temperature.Provides durable construction and protects the mattress from dust mites, keeping your mattress dry since it is waterproof.