Four sizes: Choose from single, double, king or super king sizes. Soft: Inside an anti-allergenic 100% cambric cover. Duvet: Get a 13.5 tog winter duvet. Duck feathers: Filled with shredded duck feathers and down. Anti-allergenic: Feathers are steam treated before being used. Luxuriously plump: Perfect for wrapping up warm this winter! | 13.5 Tog Duck Feather & Down Duvet | Wowcher