"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 40°C which means you can keep your duvet fresh and clean for longer. This product contains a biocidal ingredient with anti-bacterial properties that protects against fungal growth. The active ingredient is Dimethyloctadecy (3-(trimethoxysilyl)propyl) ammonium chloride. Silentnight are the UK's most trusted sleep brand with over 75 years' experience in creating products that offer solutions for every sleeper."