In most of the cases, mattresses are known to control the temperature of their surroundings just by mere breathing. That is why cotton mattresses are also considered to be a good option while choosing a mattress for your household, as cotton breathes more freely than foam. However, covering your cushions with a cotton bed cover would mean no harm to the mattress. The protective layer would make sure that your mattress is always clean and does not succumb to any stains.