Once you have measured your mattresses thickness (height), add 2 cm to it. If your mattresses thickness is 21 cm, consider a thickness of 23 cm. Because you should always buy a size up, you should buy a thickness of 27 cm for a Noxaalon® cover, and of 28 cm for a Texaal® cover. If you have any doubt, we are at your disposal by phone at 02.33.88.70.94 (France) or +33(0)220.127.116.11.94 (other countries).
Advice : when you measure your mattresses dimensions, do it at its ends, where it is thicker.