Made from a sumptuously soft fleecy fabric this underblanket benefits from ultra thin wires to provide ultra efficiency heating up ready in just 10 minutes yet you can rest in total confidence thanks to a clever sleep safe automatic overheat protection shut off system which allows the blanket to be used with complete safety right through the night the easy to use detachable controller enables it to be conveniently machine washed and tumble dried fully fitted for total mattress coverage