Polypropylene cover filled with anti bacterial treated polyester hollowfibre which protect against dust mites. Homedream Pillows Features: Pack of 4 Anti bacterial Washable Cover: Polypropylene Filling: Polyester hollowfibre Available in: Pack of 4 Pillows 4.49 5 DL D False Bedding 5.99 5.99 Homedream Anti Allergy Pack of 4 Pillows | Kaleidoscope