Mattress Full Bed Hypoallergenic Down material description Hardness: Relatively hard (front) Moderate (back) 1.3E coconut fiber + Independent spring bag 2.3D German breathable fabric 3.3E Malaysian coconut fiber 4.Highly elastic foam 5.Shaping nylon fabric 6.Hard PK cotton 7.Independent spring bag 8.Hard PK cotton 9.3D German breathable fabric This Mattress Soft & hard dual-purpose (about 24cm thick) Feature: Applicable for whole family. As the one side is soft and the other side is hard, so that child can sleep on the back of mattress to protect vertebra, and the adult can sleep on the front. Soft and hard, double sides, more options for your good sleep.