A fitted sheet is different in that the corners are elasticated so that it is not necessary to tuck the sheet under the mattress as the elastic will serve to keep it in place. It is not possible to use a fitted sheet as a top cover because of the elasticated corners.

What are filament fibers? Some of the most common ones used for satin are silk, nylon, and polyester. Traditionally, satin was only made with silk but modern materials like nylon and polyester are now used, too. Staple fibers include materials like cotton and rayon, which are used for sateen.

2. Satin

More expensive

Generally speaking, the higher the thread count, the softer and more durable the bedsheet will be.  However, it's worth noting that thread count is not the only indicator of quality.  Other factors, such as the type of bedsheet material used and the weaving technique, also play a role in determining the overall feel and performance of the bedsheet.