How to Shop for a Bed-in-a-Box—Plus, a Few of Our Favorite Picks: "With a one-inch top layer of foam, a secondary two inches of higher density gel-infused foam, another inch of hyper-dense memory foam (with a gel infusion!), and a final inch before the eight-inch base of coils, this hybrid model from Brooklyn Bedding will keep you calm, cool, and collected all through the night."