The refined steel cloth bag spring highly supports the pressure and has a hard and durable design, which is more suitable for Asians' sleep habits 450 grams of hard cotton is made by hot air process. Compared with ordinary hot air cotton, the proportion of low melting point fiber in hard cotton is higher Environmental protection of 450g towel cloth: it is a combination of pure natural raw materials, which is both environmentally friendly and green 2cm sponge is light, comfortable and soft, creating a more comfortable sleeping environment 2 cm memory cotton is very sensitive to temperature, and temperature changes provide different soft and hard; Slow rebound, no strong rebound after pressure.syi