The Natural mattress provides stable support and subtle elasticity. Seven-zone pocket springs have been combined with a layer of XL comfort foam and a sisal-jute insert. This design contributes to the increased firmness and durability of the mattress, which makes this model very popular.Pocket springs 7 zones of hardness Sisal-jute support insert Comfort XL foam Air-conditioning belt Membrane fabric Air-conditioning fiber Oeko-Tex Standard Anti-allergic product Two-sided Height: 21 cm