The extra warm 135 tog bed duvet has a cottonpolyester rich cover it has ultra soft luxury hollow fibre polyester fillings and is machine washable which makes it a comfortable easy care product it performs like a natural white goose down duvet and has a tog rating of 135 this extra warm 135 tog bed duvet is the ultimate in luxury it is warm for winter and has nonallergenic qualities the duvet is also filled and covered with premium quality layers