What is the difference between a 90×190 and a 90×200 mattress?

The only difference is 10 centimetres in length. A 90×200 is the current standard single size and is widely available. A 90×190 is a non-standard size, produced specifically for bed frames that measure 190 cm in length. If your bed frame is 90×200 cm, always choose a 90×200 mattress. If your frame is 90×190 cm, a 90×200 mattress will stick out 10 cm at the foot end, which affects both aesthetics and support. Always measure your bed frame before ordering.