A host of materials such as polyester, down, and cotton create mattress protectors. Moreover, waterproof mattress protectors come with a waterproof coating, which is typically vinyl or polyurethane.
A mattress protector made of cotton (Molton) is usually a good choice as they are hygienic, and you can wash them at 60 degrees. Additionally, they are breathable, sturdy, and retain their shape.
If you enjoy a cosy sleeping climate, a wool or wool-mix mattress protector is a fantastic alternative, particularly for those who tend to feel cold quickly.
Unfortunately, a mattress protector created using wool or a wool-mix fabric can only be washed by hand. Thus, it might not be as hygienic.