King Bed Sheets
The sheets that are large may be fit for a king size bed. These may be called king size bed sheets. The king size bed sheets, if not fitted with an elastic band on the corners, could be considered the one size fits all sheet. Especially if the sheet is thin. The sheet can be pulled around the mattress to hide the extra material or you can get a tall bed or raise the mattress somehow and let it hang to the floor or tuck it under a box spring or other mattress. If left hanging or tucked under a box spring mattress this may improve the odds of the sheets getting damaged.
King Size Bed Sheet Materials
Basically any materials can be applied to a king size sheet. Cotton is normally used because it is cheaper, more readily available and it is a quality material. However there are many satin, silk and other fine material king sheets out there, they are just a little more expensive. The size of the sheet will probably increase the cost of the sheet no matter what the material. This may be a big factor as not as many people own king size mattresses. The most common sheet is, again, probably going to be cotton. The cotton sheets will likely be the cheapest sheet for a king size bed. If you don't have a king sized bed, there are still many benefits to owning a king size bed sheet. It may be more expensive to own but it will cover your bed, and ti is basically a one size fits all. They sheets are also fun for kids to use as tents and such.