The Firm Q4 Adjustable Air Chamber Mattress, by Instant Comfort, is a deluxe, comfort adjustable mattress. Using the latest technology and high quality components you can adjust the firmness to find the feel that is just right for you to achieve your best nights sleep. Atop the air chambers is 2" of Convoluted Comfort Foam giving you softness in addition to the firmness you choose. The Air Chambers are encased with high density foam for a firmer edge to prevent roll-off. Select sizes allow you to adjust the comfort level on each side independent from the other so you can each customize your side.