There is another option which is the Tru-North magnbetic mattress pad line which is based on a state-of-the-art design. The Tru-North Ultra models are 2/14" thick and designed to be placed on tthe top of the regular mattress pad. The magnets used are placed in a tight grid wich produces a pure North pole magnetic field which is deemed correct by both Bonlee and Philpott. The Tru-North models are manufactured and sold by Magna-Pak Inc. http://www.magnapak.com. This website contains a very comprehensive and helpfull information on selecting the best magnetic mattress at the best price.