Fitted sheets cover the mattress – the elastic band holds them firmly in right place. Their function is to protect the mattress and ensure smooth and soft surface for the sleeping person to lie on. When purchasing fitted sheets, it is important to have the right dimensions of a mattress – the length, the width and the thickness.
As fitted sheets must pull snugly over the mattress and not be easily pulled off, the right dimensions matter a lot. The wrong size fitted sheet simply will not be able to go neatly round the corners, and will not stay in place.