Goose Feather & Down Double Duvet 13.5 Tog This sumptuous duvet has a 230 thread count cotton percale cover and an internal pocket construction with baffle walls which keep the filling evenly distributed. Feathers are not as thermally efficient as down and therefore slightly more are required to create the same warmth factor. This is why Bedeck\'s 13.5 Tog duvets are filled with a higher percentage of white goose feather, creating that satisfying heavy feel synthetic and down duvets lack. Filling: 90% white goose feather / 10% white goose down. 13.5 Tog; perfect for cosy winter nights. Professional laundering in a large capacity machine is recommended. Do not dry clean. Do not bleach. Tumble dry with care. Do not iron. Air outside in good weather