Buying the best online luxury mattress is the first step. There’s another important item to add to the checklist apart from the bedsheets and pillowcases. This item is called a mattress protector.  A mattress protector is an additional layer added to the top of the mattress. It is available in three major types – with straps to secure around the corners, with elastic to cover the mattress like a fitted sheet, and with a zipper that envelopes the mattresses completely…