The Silentnight anti-allergy duvet is filled with anti-allergy hollowfibre that actively protects your duvet 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. It is also machine washable at 40C which means you can keep your duvet fresh and clean for longerSilentnight 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.