The high density sponge mattress is shaped to fit the body weight change. Compared with other mattress materials, it has the characteristics of lightness and comfort. At the same time, it sleeps with its partner without being upset by his tossing and turning. Compared with the general sponge mattress, the hardness of the high density sponge mattress is stronger. It is more comfortable for people to lie on the high density sponge mattress.