Electric Under Blanket Warmer by Expressions is placed under the bed sheet or blanket for warmth. It radiates heat from beneath, inducing deep restful sleep even in the coldest of winter nights. At the same time, the heat therapy relaxes the tired back and legs muscles. It helps ease stiffness and soreness and allows you to wake up feeling rested and fresh. Expressions electric bed warmers are time tested, safe and comfortable. No more wrestling with heavy electric blankets that keep sliding off. No more laundry worries. No more cold winter nights. Expressions electric bed warmer is held securely on the mattress, under the bed sheet. This keeps it protected from dust, adding years to its life. Expressions electric bed warmers reduce your electricity bill to a fraction, since you won't need heat pillars or radiators anymore!