The DOUXE mattrass protector is made of 100% cotton, providing good ventilation. It will keep your mattress clean and it will also prolong its lifespan. We advise to always use a mattress protector underneath the fitted sheet to protect your mattress from dirt, sweat and wear-down. The DOUXE Mattress Protectors are available in two corner heights, 30 cm and 40 cm. The 30 cm mattress protector can be used for mattresses ranging from 5 cm to 30 cm due to the strong elastic finish all around.