Is a 140x210 cm mattress a single or a double?

A 140x210 cm mattress sits between a single and a double: wide enough for one person to sleep very comfortably, and just about sufficient for two people who prefer to sleep close together. A twijfelaar is described as a large single for those who want more space, or a small double for those who need less, and the 140x210 follows the same logic with the addition of extra length. For couples who sleep together regularly, a 160 cm wide mattress offers meaningfully more personal space.