AllerEase Organic Cotton Cover Allergy Protection Mattress Cover, Full Cotton Imported 100% Breathable organic cotton cover provides natural allergy protection Top flyover fabric: 100% Organic Cotton, Top and Bottom Quilted Fabric: 100% Polyester Allergy defense fabric blocks dust mite matter and other nonliving allergens from collecting in your mattress - these allergens can trigger asthma and allergy symptoms Mattress cover stretches to fit mattresses up to 12" deep Fitted five-sided construction provides easy on and off for laundering