It is important to remember first of all that the size of the mattress topper must be the same as your mattress. Check your measurements carefully before ordering your mattress topper. For example a mattress 140x200cm will have to be covered with a mattress topper 140x200cm. This is a single bed or a bed for teenager. The synthetic mattress toppers are provided with elastics for fixing the mattress topper. On the other hand, down mattresses are kept alone because of their heavier weight. If you choose a 6cm high down mattress topper, be sure to check the size of your fitted sheets to make sure they fit the thickness of the mattress topper set. The 140x200cm mattress topper is a complement of comfort to a firm or flexible mattress. It promises a maintenance of a remarkable softness. It marries wonderfully with a mattress of good maintenance. Those who have had the chance to sleep in a luxury hotel welcoming Dumas Paris products recognize its unequaled comfort! However, the mattress topper will not revive a used mattress. The natural mattress topper is not washable, either in traditional machines of the house or at a professional. Just like a traditional mattress, it must be protected with the appropriate protective cover that we offer. It is washable in your home machine, to ensure the hygiene of your bedding. Keep your usual knit protection to keep your mattress topper set over time.