The Better ZZZ's product was originally designed to remediate mattresses with metal springs in them. Metal amplifies EMF challenges, which is not a good thing when you're sleeping on top of one of these mattresses.
 
The Better ZZZ's can also be used on an airplane (put it on the metal part of the seat belt) or in a car (find a patch of metal under the floor mats or in the trunk area).
 
1 already included in Home & Condo Bundles