Does a 180x210 cm mattress require special bedding?

Yes, it does. A standard 180x200 fitted sheet will not fit a 180x210 mattress correctly. The recommended duvet size for a 180x210 cm mattress is 240x220 cm, which is a lits-jumeaux extra format. This size is available from specialist bedding retailers but is less commonly stocked than standard sizes, so it is worth confirming availability before purchasing. Tuur® offers bedding accessories in this format as well.