What is the difference between an 80×200 and a 90×200 mattress?
The difference is 10 centimetres in width. A 90×200 is the most common standard single size and offers slightly more freedom of movement. An 80×200 fits narrower bed frames and is the right choice if you want to place two mattresses side by side in a 160×200 bed. At 80 cm wide, it's a solid starting width for a single bed.