Mattresses are an investment - enough so that they can’t go unprotected. If you want to keep the warranty on your mattress, best you keep it protected with a mattress protector.
A good quality mattress protector could also save you from uncomfortable reactions to many allergens, including dust mites. By blocking moisture and ensuring that spills are effectively cleaned and dried, you may also prevent the growth of mould and bacteria within your mattress.
It’s crucial, then, to protect your mattress, so that it continues to give you the best, most comfortable sleep, for years to come.