The Raised Downy Airbed is engineered with dual chamber construction: the lower chamber functions as the box spring form on a traditional bed, providing extra firmness and support while the upper chamber functions as a mattress. Plush, waterproof flocking covers the mattress top for a luxurious feel to provide a cozy night's sleep. As a part of the Dura-Beam series of airbeds, the Raised Downey Airbed is engineered with Fiber-Tech Construction, which is comprised of thousands of high-strength polyester fibers, this airbed provides enhanced comfort, stability, and support. Unlike traditional airbed construction, high-strength polyester fibers do not stretch over time, resulting in superior and long-lasting durability. The resulting surface is comfortable and secure, whether you're sleeping at the in-laws' overcrowded house or setting up a guest bed in the basement. An indentation on the side helps grip fitted sheets so you can feel comfortable in the bedspread you already have.