One side is hard and another side is soft with and iron hand in a glove use the high quality six turn s spring. Strong bounce with natural paim fibre mat and high qualith ABS plastic balance net inside for increasing the support of mattress. High density sponge and Belgium inported brocade material. There are 800 breathe holes for dampporoot ardound the four sides in order to keep dry inside the mattress. To make you sleep comfortable and energetic.