The comfort mattress series from the Baby Dan is designed with a linen and wool content that keeps on the heat and transports the moisture away. The mattresses are reversible, so the wool side warms, while the hearing side is more ventilating. The mattress is made with a comfortable PU foam core which has a density of 21 kg / m3. The top of the foam core is a 210 gram wool plate on one side, while there is a sounding plate on the other side. The mattress is covered with an antibacterial cover that reduces the appearance of dust mites and is designed with a zipper all around, so it can easily be removed and washed. The cover is made of 70.5% cotton and 29.5% polyester. We recommend that you often air your mattress.