This 23 cm thick mattress is covered in 100% polyester fabric. The entire interior of the mattress is filled with 20 cm thick layer of profiled foam. It is SKY CELL EL-2840 type foam, and it fills the whole interior the mattress. The foam is covered with a Tricover covering that separates the foam from the outer covering. The thick outer cover is hypoallergenic and can be removed from the mattress. The mattress has H3 hardness, suitable for people weighing up to 130 kg who want a harder mattress. Before use, wait 72 hours after developing the mattress at 22 degrees.