The California King Mt. Blackburn Pillow Top mattress made by SleepCo Bedding is manufactured here in the USA. It is specifically designed to articulate on adjustable beds to customize your experience. Its coil systems are encased in foam to provide more sleeping surface and improve the edge support. Alternating offset coils provide increased support, reduce bed-roll-off and promote better comfort, support and alignment than traditional coils. Plus a layer of premium foam engineered in the lumbar region provides added support and comfort. The Mt. Blackburn Pillowtop is comprised of a Quilt Layer (Premium Knit Cover) Comfort and Support Layers (1 ½” Comfort Foam and a gel Infused Memory foam added to the lumbar region) plus a Support Core (1” HD Loft Pad, a 6” Foam encased open coil spring unit provides long lasting support, and a2 ¼” HD Loft Pad). It comes available in Twin, Twin XL Full, Queen, King, and California King. This bed is versatile enough for the Primary room, supporting every night sleep, or a spare room that will give your guests a comfortable night's rest.