Washing only makes it softer and will not remove its efficacy after repeated washings up to 200 degrees Fahrenheit. This is the best high tech to filter out very small things and works so well you will not know it is there.
Evolon Allergy Mattress Protector | 9" Twin Zippered Mattress Encasement | Sl...
AllerEase Waterproof Mattress Protector, Maximum Allergy Mattress Protector, ...
AllerEase Waterproof Mattress Protector, Maximum Allergy Mattress Protector, Twi