I purchased a 12 inch memory foam mattress which arrived shrink wrapped in a box. I opened it this morning, and placed it on the bed. As of this morning, the mattress appears to be too big for the foundation under it. The mattress hangs a bit over all 4 sides. It's also only about 6 inches tall. My question is, as the mattress increases in height to the 12 inches, will the 4 sides "shrink" a bit to accommodate it, making it fit the foundation properly?
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single memory foam mattress london