This unique combination of our most premium memory foams delivers a breakthrough in pressure-relieving comfort. Plus, you’ll get targeted support for your back and core from extra-supportive gel memory foam placed in the middle of the mattress and more support for your whole body with a densely-packed coil design–all topped with a refreshing cool-to-touch cover and a firmer feel.ComfortLoft™ Knit Cover with Chill™ and AllergenProtect™: Feel refreshing cool-to-touch comfort the moment you lie down, plus get super-soft stretch and easy care from the soft knit fabric. Plus, stay fresh and clean by protecting your mattress from common allergens, such as dust mite dander. Bring on the puppiesResponse™ Pro HD Encased Coils: Get even more support for your whole body with this densely-packed system of our most durable coils. Individually wrapped, they also reduce motion transfer so you’ll feel less movement from your partner throughout the night.SealyCool™ Gel Memory Foam: Found in in the middle of the mattress directly under your back and core, SealyCool™ Gel Memory Foam gives you targeted support and quality, cooling comfortComfortSense™ HD Gel Foam: Get even more personalized comfort and support with this upgraded, open-cell memory foam – designed to perfectly sense and respond to your body’s unique shapeComfortSense™ Gel Foam: Get personalized comfort and support as this specialty memory foam senses and responds to your body’s unique shapeSealyCool™ Gel Foams: Get cushioning comfort and more flexible and durable support with the cooling comfort of this gel-infused version of our high-quality traditional foamSealySupport™ Gel Foam: A version of our high-quality traditional foam, SealySupport™ is found deep down in the mattress for a unique combination of cushioning comfort and flexible supportDuraFlex™ Pro Edge System: Densely-packed coils surround the edge of your mattress to create a solid seating surface, more space to sleep, and added durability. A ventilated design provides refreshing airflow. Go ahead–take a seatMattress Top Type: Tight TopMattress Type: InnerspringIncluded: 1 Mattress(es)Features: Fire Resistant, Cushioning Layer, Foam Layer, Wrapped CoilsAdditional Information: Suitable for Adjustable Bed FramesCoil Count: 658 CoilsManufacturer Warranty: 10 Year LimitedBed Size: TwinMeasurements: 74 Length/Inches, 12 Height/Inches, 38 Width/InchesBase Material: 100% PolyurethaneComfort Type: Extra FirmCare: Spot CleanCertifications And Listings: Cpsc - 16 Cfr 1633 Compliant, Cpsc - 16 Cfr 1632 CompliantMattress Height: 12"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 1-800-442-7902Don’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. This mattress meets the requirements of 16CFR Part 1632 (federal flammability (open flame) standard for mattresses and mattress padsThis mattress meets the requirements of 16CFR Part 1633 (federal flammability (open flame) standard for mattress sets) when used with foundation Sealy® Posturepedic Plus Porteer Ultra Firm Mattress Only