Classic Brands 12 Inch Memory Foam Mattress King The 12 inch mattress composed of premium memory foam to help relieve pressure for a restful night's sleep at an affordable price. The knit cover is breathable as well as durable. Premium memory foam comfort layer can support each part of the body evenly and individually. Memory foam mattresses are designed to mold and cradle every part of your body evenly which can allow you to get in your most comfortable position for a more restorative sleep.