Find personalized sleep comfort with the Copper II plush twin extra-large mattress. Sealy's exclusive Posturepedic Technology™ combines with a cool-to-the-touch sleep surface and an additional layer of SealySupport™ extra soft foam in the comfort layer to deliver great sleep. Sealy's latest innovation in gel memory foam, ComfortSense™ foam, responds to your body’s unique shape for more comfort. Plus, SealyCushion™ extra soft foam adds a cushioning affect. With exclusive Posturepedic Technology™ like the Response Pro ZONED HD encased coil system, you'll enjoy durable all-over support with 20% more coils in the middle of the mattress—a spot where you need it most, especially for your back. This densely packed system of hourglass-shaped coils with a dual-stage design ensures personalized support. Each coil moves independently for more targeted support. Plus, extra support is found around the mattress's edges with the DuraFlex™ coil edge system. Its high-density, flexible coil border surrounds the mattress for better edge support, a more usable sleep surface and improved durability. The UltraStretch ComfortLoft™ cover with MoistureProtect™ works with Immersion™ advanced memory foam with Chill Technology™ to deliver a cool feel. The cover is designed to draw moisture away from your body, while the advanced memory foam with a slower response allows for a more breathable, cool-to-the-touch sleep surface. Foundation/box spring available, sold separately.