Luxury Goose Feather & Down Anti-Allergy Duvet [13.5 Tog, King Bed]. This Luxurious Goose Feather & Down Duvet Ensures You with A Relaxing and Refreshing Sleep, Wake Up Rejuvenated Every Morning. Our goose feather & down duvets are made from anti-allergy 100% cotton outer cover and goose feather inner filling (85% Feather-15% Down).