Featuring 825 density coils, this supportive mattress offers zoned comfort and pressure relief where you need it-with upgrades available for even more cooling and comfort. Gel memory foam lumbar support band provides support for the lower back and hips Serta® gel memory foam - serta® gel memory foam this unique gel memory foam contours to the body for cradling comfort and allows airflow to keep you cool and comfortable throughout the night. 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.\" 825 edition custom support coil system - in addition to providing curve-hugging support and minimizing the impact of your partner's motions, this system of up to 825 individually wrapped coils features serta's bestedge® foam encasement technology - an extra-deep foam rail to help reduce edge roll-off and extend the sleep surface. 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 Top Mattress Type: Innerspring Included: 1 Mattress(es), 1 Box Spring(s) Features: Breathable, Foam Layer, Antimicrobial, Temperature Regulating, Wrapped Coils, Adjustable Base Compatible Additional Information: Suitable for Adjustable Bed Frames, Conforms To Body Coil Count: 493 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Maximum Weight Limit: 1000 Lbs Base Material: 90% Metal, 10% Foam Comfort Type: Medium Mattress + Box Spring Measurements: 22.5 Depth\Inches, 70 Length\Inches, 40 Width\Inches Care: Spot Clean Certifications And Listings: Certipur-Us Certified Country 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 1-800-442-7902 Don’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 Blue Lagoon Nights 13.5" Medium Mattress + Box Spring