Enjoy sleeping on a bed that conforms to you with this memory foam mattress. Multiple layers combine support with softness, and the standard dimensions let you use this king mattress with your existing box spring or slats. The open-cell technology used on this bed ensures ample air flow, which keeps you cool when the temperature rises. Eliminates motion transfer and uncomfortable pressure points Soft: 3-inch layer of comfort foam, 3-inch layer of plush supportive polyurethane foam, 8-inch layer of base foam Medium: 3-inch layer of comfort foam, 3-inch layer of medium supportive polyurethane foam, 8-inch layer of base foam Firm: 3-inch layer of comfort foam, 3-inch layer of firm supportive polyurethane foam, 8-inch layer of base foam Can be used with any conventional box spring or platform foundation Dimensions: 14 inches high x 80 inches wide x 76 inches long Meets all flammability standards Care instructions: Spot clean Memory Foam Tips: Remove from packaging within 72 hours of receipt to maximize memory foam expansion.This product arrives very tightly packed. Unwrap and allow 48 hours for this product to return to its original shape.Being sealed in plastic packaging sometimes traps odors. After unwrapping, allow product to air for a few hours.Due to machine-cutting manufacturing processes, there may be slight variances in the dimensions of this product.Due to the nature of Memory Foam the firmness level of every item is unique. Please be advised that even similar products may produce different firmness results.Once opened this product is not returnable