Avenco California King Mattress, 10 Inch Cal King Size Mattress in a Box with Gel Memory Foam & Breathable Cover, Pressure Relieving, Medium Firm Supportive, CertiPUR US Certified FengWu Maximise your room's functionality with What s Included Comes Maximise your room's functionality with the built in shelf compartment located at the back of the bed 2 slim pouches hold pens and pencils for hassle free access PRESSURE RELIEF & BETTER AIR FLOW: A layer of wave foam and a layer of comfort foam are added to the core layer of the cal king bed mattress Say goodbye to an unsuitable firm mattress and consider a medium firm cal king bed mattress to a comfortable sleep