A mattress protector is an item of removable bedding that sits on top of or encases a mattress to protect it. It is used to protect the mattress from spills, stains, dirt, dust mites, and other allergens. It is also used for waterproof protection, to extend the life of the mattress, and to protect against bed bugs. Mattress protectors typically come in bed sheet form and may be made of waterproof materials like vinyl, cotton, terry cloth, bamboo, and microfiber. They are typically removable and machine-washable, making them very easy to clean.