4-way stretch knit cover Luxury cotton fiber; super support polyester fiber 1.5" super soft quilt foam; 2" zoned plush support foam .5" high-density gel support memory foam Power packed 15-gauge wrapped coils Ashley edge "steel encased"; 2 perimeter rows of 13-gauge wrapped coils for edge support Mattress in a box quick and easy setup; please allow 48 hours for your mattress to fully expand after opening 1" high-density base foam