The Silentnight anti-allergy duvet is filled with anti-allergy hollow fibre that actively protects your duvet from bacteria and dust mites. This helps to prevent allergies and keep your duvet feeling fresh and clean, whilst keeping you comfortable for a restful night\'s sleep. Silentnight anti-allergy fibres are approved by the British Allergy Foundation, which means they have the seal of approval. Silentnight fibres have been scientifically tested and are proven to reduce or remove allergens from the indoor environment. The 13.5 tog anti-allergy duvet is ideal for colder winter months and is encased in a soft microfibre cover to keep you relaxed and comfortable throughout the night.