The Silentnight Winter Nights Mattress Protector is filled with anti-allergy hollowfibre that actively protects against bacteria and dust mites. This helps to prevent allergies and keep your bed feeling fresh and clean, whilst keeping you comfortable for a restful night’s sleep. Silentnight's anti-allergy fibres are approved by the British Allergy Foundation, which means they have the utmost seal of approval. The mattress protector will protect and prolong the life of your mattress, helping to shield spills, stains and general wear and tear.