Incorporating a cotton-filled top layer and a hollowfibre-filled bottom layer, this supremely comfortable mattress topper provides an extra thick surface of warmth and support to your bed. The fillings are encased in a super soft breathable pure cotton cover for even greater levels of comfort, while the dual layers easily zip together and apart, making washing and drying a breeze. This mattress topper is designed to fit a mattress depth of up to 35cm using its elasticated straps. Please note that we do not recommend using this mattress topper with an electric blanket, as it will significantly limit its effectiveness.