Cover your comforter with a dust control duvet cover for the ultimate in health and comfort! These high quality comforter encasings are breathable, cool and comfortable, yet provide excellent protection against the negative effects that dust mites have on allergy and asthma sufferers. These duvet encasings are constructed with such a tight weave that they need no membrane (membranes do not breathe and can be uncomfortable to sleep on). Make sure to cover your mattress, boxsprings and pillows as well.