AllerEase Waterproof Allergy Protection Zippered Mattress Protector 100% Polyester With Polyethylene Film Imported Allergist recommended Allergy proof fabric prevents microscopic particles that can trigger allergy and asthma symptoms from collecting in your mattress Waterproof fabric protects your mattress from spills and stains Durable zippered closure Backed by the Good Housekeeping Seal of Approval