Fitted Mattress Cover ensuring the blanket stays in position night after night. Ultra-thin wires and the soft Polyester finish provides you with a comfortable nights sleep. Single Control Heating Technology FAST: Quick heat up time, with 3 controller heat settings for greater control & luxurious comfort, save money and heat running at less than 2p an hour. Easy to use with the LED single controller. The elasticated skirt will keep it firmly in place all night long. SAFETY: Advanced overheat protection and auto shut off for your safety and peace of mind. MACHINE WASHABLE: Detachable single controller enable you to easily machine wash your electric blanket at 40 degrees. Meaning you can enjoy the clean and fresh, electric underblanket's polyester blanket time after time.