These Anti Allergy pillows are super full and cosy, with an ultra soft microfibre cover to give you the ultimate comfort. The pillows are machine washable, please read the care labels. The polyester filling is treated with an anti-allergy treatment, which is a proven antimicrobial, which helps to kill and stop the growth of microorganisms such as: odour causing bacteria, mould, mildew, fungus. Dust mite resistant. The anti allergy treatment will last, wash after wash giving protection through the products entire life.