🛏️ Silentnight Anti-Allergy 13.5 Tog Double Duvet | Winter Warmth | Hypoallergenic ❄️🦠. Stay cosy, warm, and allergy-free this winter with theSilentnight Anti-Allergy 13.5 Tog Double Duvet. Designed for colder months, this thick, heavy quilt providesluxurious comfort and anti-bacterial protection to help you sleep peacefully every night – especially if you're prone to allergies or asthma.