Incorporating an ultra cosy duck down and feather filled top layer, and a supportive duck feather filled bottom layer, this supremely comfortable topper provides an extra thick layer of warmth and structure to your bed, while prolonging the life of your mattress. The top layer is easily removed for washing, while elasticated buttons in every corner and down the sides allow for this layer to be taut or loose according to your needs. A super soft pure cotton case provides breathability, smoothness and even greater levels of comfort while you sleep. Please note that we do not recommend using this mattress topper with an electric blanket, as it will significantly limit its effectiveness. This range of naturally filled toppers is housed in Nomite marked casing: a first for the UK market. The tight weave of the cover fabric ensures no down or feathers can escape, whilst it provides an effective barrier against dust mites. This means it is suitable for house-dust-mite-allergy and asthma sufferers. Supported by scientific research, our market leading casing gives everyone the opportunity to enjoy the multiple benefits of natural fillings. Please note: This is a natural product, and we recommend that you air it for 24 hours before use. The soft and fluffy down in the top layer compresses during packing and transport. After unpacking and airing the down top layer will recover and the mattress topper will offer a fluffy and comfortable sleeping support. Find out more about our animal welfare policy .