Hi jladybugj,
Sorry … I didn’t realize you were asking about a mattress protector.
There is more about the pros and cons of the different types of mattress protectors in post #89 here.
A mattress protector is always a good idea to protect your mattress from the body fluids and oils that we all release each night, to help reduce dust mite populations, to keep your sleeping surface in a clean and hygienic condition, and to protect against accidents and spills. It will also protect the warranty because mattress warranties are usually voided with even a small stain on the mattress.
Phoenix