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A Guide to Buying a Double Foam Mattress A double-foam mattress offers support for the spine and the ability to sleep in any position. It also regulates temperature and wicks away moisture. It comes with an incredibly soft cover. The Casper is a mattress-in a-box model that helped popularize online mattress shopping. Its zones of layering are ergonomically designed to align the spine and it's highly affordable. Comfort Unlike traditional spring mattresses, foam models have numerous layers of materials