In the case of mattress encasements, what matters the type of material, its size, and the type of protection needed. Encased mattresses can be made from cotton, poly, or vinyl, all which provide comfort at different levels of durability. It is also key to get the right size so that it does not shift around during the course of the night. Also, think about whether you require waterproofing or allergen barrier features as extra protection in considering your requirements. Correct selection of a mattress protector will provide sufficient comfort and safety of the mattress.