Specs Prelude 11” Pocket Coil Mattress - Full Layer Cool Gel Foam • - Comfort Foam - Insulator Padding Twin-XL/ Single / Double / Queen / King *Compatible With IFDC Adjustable Beds IF-3520-TXL/ IF-3521-D/ IF-3522-Q (Value Model) IF-3610-TXL/ IF-3611-D/ IF-3612-Q (Deluxe Model)