Dust mites are a constant problem for millions of americans who suffer from daily allergy and asthma triggers，my son is the one of millions ，this mite free waterproof mattress protectors prevent dust mites from passing thtough the surface of protector where they would normally multiply and defecate！this mite free mattress protector reduce dust mite exposure to the mattress，make my son can be sleep better，will buy another one！ great quality and easy to use and wash