Electrowarmth bunk warmers radiate heat from below allowing you to relax into a deep and restful sleep. Proudly, manufactured in america by electrowarmth since 1939. Many improvements since then but the original "on the mattress" principle has been well proven. On cold winter nights, keeps the chills away with this safe and efficient bunk warming pad. The bunk warmer provides continual and even bed warmth throughout the night. Provides sleep inducing relaxing heat from below that is so soothing, like soaking in a tub of warm water. This relaxing sensation helps lull you to sleep. Soothes aches and pains. Real relief from arthritis. Fibromyalgia and other body aches. Especially if you have been driving your semi all day. When you use the electrowarmth heated mattress pad you can save money by not idling your truck all night to stay warm. At a gallon per hour sitting there idling it doesn’t take long to pay for a bunk warmer. They make great christmas, birthday and anniversary presents your friends will be thanking you for many years to come. To operate, the warming pad is equipped with a comfort control. The comfort control levels are infinite from 1 – 7. As you truck cools down the bunk warmer stays on longer thereby keeping you the same comfortable warmth setting. Hand washable. 115v sizes available to fit all bed sizes 3 twins, 5 full, 5 queens, 2 olympic queens, 2 kings, and 1 california king sizes. The mattress pad is covered by a limited 1-year warranty with a 30 day money back guarantee.