​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) Features: Breathable, Cooling, Wrapped Coils, Antimicrobial, Temperature Regulating, Foam Layer, Adjustable Base Compatible Additional Information: Conforms To Body, Suitable for Adjustable Bed Frames Coil Count: 493 Coils Manufacturer Warranty: 10 Year Limited Bed Size: Twin Measurements: 40 Width/Inches, 70 Length/Inches, 13.5 Height/Inches Maximum Weight Limit: 1000 Lbs Base Material: 90% Metal, 10% Foam Comfort Type: Medium Care: Spot Clean Certifications And Listings: Certipur-Us Certified Mattress Height: 13.5" 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. Includes mattress only. Mattress plus box spring option also available.