The Silentnight Anti-allergy pillows are filled with anti-allergy hollow fibre that actively protects your pillows from bacteria and dust mites. This helps to prevent allergies and keep your pillow feeling fresh and clean, whilst keeping you comfortable for a restful nights sleep. Our anti-allergy fibres are approved by the British Allergy Foundation, which means they have the ultimate seal of approval. Our fibres have been scientifically tested and are proven to reduce or remove allergens from the indoor environment. These medium support pillows are ideal for people who sleep on their back or side and are encased in a soft touch microfiber cover that is both soft and easy to care for and will keep you relaxed and comfortable throughout the night.