Sleep Inc. 13-Inch BodyComfort Select 4000 Luxury Plush Mattress, King Premium Innerspring 13-inch luxury plush mattress features hundreds of premium innersprings designed to increase support and flexibility Features: 5-Zone Convoluted Foam for active support; 360 Degree Foam encasement for increased edge support; TENCEL luxurious cover provides moisture management FOUNDATION (BOX SPRING) SOLD SEPARATELY: Pair with the Body Comfort 9" Wood or Semi-Steel Foundation to complete your new set Handcrafted in the USA; 10-Year Non-Prorated Limited Warranty (Contact Amazon for warranty details) Body Comfort Select series includes: 1000 Luxury Plush, 2000 Luxury Extra Firm, 3000 Luxury Pillow Top and 4000 Luxury Plush