With three heat settings and a convenient pre heat function this heated underblanket fits almost to the edge of the mattress to close down cold spots and uncomfortable draughts the detachable controller allows it to be machine washed and tumble dried made from soft polyester it is fully reversible and with a patented beurer sleep safe system its perfectly suitable for all night usetie down fittings to secure to mattresspower light indicatordetachable controllerbss overheat protectiondou