What is the difference between a 90x200 cm and a 90x210 cm mattress?

The only difference is 10 extra centimetres in length. Small as it sounds, those centimetres make a real difference for taller sleepers. With a 90x200, feet or legs can hang over the edge, negatively affecting sleep quality and spinal support. A 90x210 gives your body the space to lie fully stretched and properly supported throughout the night.