Duck feathers: Filled with shredded duck feathers and down. Soft: Inside an anti-allergenic 100% cambric cover. Duvet: Get a 4.5 tog winter duvet. Four sizes: Choose from single, double, king or super king sizes. Luxuriously plump: Perfect for wrapping up warm this winter! Anti-allergenic: Feathers are steam treated before being used. | 4.5 Tog Duck Feather & Down Duvet | Wowcher