This lofty topper's upper layer unzips easily for washing. The soft polyester cover gives a luxurious feel and the base layer provides additional support and comfort. Suitable for Regular Washing Washable at 40°C, allowing for an effective clean that's much kinder to the environment. Dual Layer The base layer can stay on the mattress while the top can be removed for washing. A base layer gives support, a top layer adds comfort. Please note: we do not recommend using this mattress topper with an electric blanket as it will significantly limit its effectiveness. This topper fits mattresses up to 32cm deep.