INCLUDES COVERS - covers are poly/cotton; includes velcro strap and fitted sheet type fit, easy to remove and install for machine washing. King size supplied as two 38" wide covers. Available in White, Grey and Natural. DRUG-FREE RELIEF - Avana Mattress Elevator provides a 7” to 1” incline down the full length of the bed. Foam bed riser that provides a safe and drug-free solution that may naturally help with symptoms of Acid Reflux and GERD through elevation EASY INSTALLATION - Install under the mattress and enjoy the full comfort, width, and length of your original mattress. Split design allows for easier placement and removal between mattress and box spring. The full-bed-length provides additional mattress stability and support