Featuring a 3 zoned coil design, this mattress offers pressure relief and support where you need it, with a cool twist® gel memory foam that contours to your body—with upgrades available for even more cooling and comfort. Coolfeel™ fabric - a luxurious, breathable cover with a cool-to-the-touch sensation from technology that is plant-derived. Our biobased phase change material consists of 53% biobased content and is certified through the usda biopreferred® program. Antimicrobial mattress protection - keeps your mattress fresh and clean from odor causing bacteria. This product protects the mattress but does not protect users against bacteria, viruses, germs or other disease organisms. Cool twist® gel memory foam - this breathable, gel-infused memory foam gently cradles your body while promoting enhanced airflow. 850 edition custom 3 zoned support coil system. This system of individually wrapped coils provides contouring, cradling support from edge-to-edge, minimizing the impact of your partner’s movements Proudly 100% usa assembled Compatible with most frames, platforms and adjustable bases We only use foam that is certipur-us certified Mattress Top Type: Tight TopMattress Type: HybridIncluded: 1 Mattress(es), 1 Box Spring(s)Features: Temperature Regulating, Wrapped Coils, Antimicrobial, Foam LayerAdditional Information: Conforms To BodyCoil Count: 493 CoilsManufacturer Warranty: 10 Year LimitedBed Size: TwinMaximum Weight Limit: 1000 LbsBase Material: 90% Metal, 10% FoamComfort Type: FirmMattress + Box Spring Measurements: 23 Height/InchesCare: Spot CleanCertifications And Listings: Certipur-Us CertifiedCountry of Origin: Made in US Visit our Furniture & Mattress Customer Care Center for delivery options, protection plans and other services.Problem with an order or need help with a return? Our Furniture & Mattress Customer Service agents will be happy to help. Give us a call at 1-800-442-7902Don’t forget to print off your delivery checklist to avoid any delays or issues when delivering your item. Set includes mattress plus box spring/foundation. King and Cal. King mattress sets feature 2-piece side-by-side foundations for easier navigation in tight spaces. Serta Perfect Sleeper Euphoric Nights 14" Hybrid Firm Mattress + Box Spring