The Silentnight anti-allergy pillows 4 pack are filled with anti-allergy hollowfibre that actively protect your pillows from bacteria and dust mites to help prevent allergies. Our anti-allergy fibres are approved by the British Allergy Foundation, which means they have the ultimate seal of approval. The pillows are also machine washable at 40°C which means you can keep them fresh and clean for longer. Silentnight are the UK's most trusted sleep brand with over 70 years' experience in creating products to help the whole family get that 'great sleep' feeling. BACTERIA BLOCKER - Filled with anti-bacterial, anti-allergy fibres that actively protect against bacteria and dust-mites. Helps prevent allergies and keep your pillows feeling fresh and clean. ANTI ALLERGY: Our anti-allergy fibres are approved by the British Allergy Foundation, which means they have the ultimate seal of approval - perfect for allergy and asthma sufferers. TRIED AND TESTED: Scientifically tested and proven to reduce or remove allergens that could otherwise be present in some pillows. ULTIMATE COMFORT: Comfort comes first. Made with the best quality materials and fibres. Use one pillow for soft support or both pillows for medium support. MACHINE WASHABLE: Machine washable at 40°C, encased in a soft microfibre cover for great recovery wash after wash