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A Guide to Buying a Double Foam Mattress A double foam mattress offers support for the spine and provides comfort for all sleeping positions. It regulates sleep temperatures and wicks moisture away. It comes with an incredibly soft cover. is an online bed-shopping model that has helped popularize the mattress-in-a box. Its zoned layers are ergonomically designed to ensure spine alignment, and it is extremely affordable. Comfort Foam mattresses are made up of several layers that c