Amazon Basics Smart Box Spring Bed Base, 5-Inch Mattress Foundation - Cal King, Tool-Free Easy Assembly
- The look and functionality of a traditional box spring, but made from steel to support any spring, memory foam, or hybrid mattress.
- Durable steel frame and horizontal slats provide sturdy, reliable support for any same-size mattress.
- 2-piece fabric top and bottom covers the frame and zips together for full coverage.
- interlocking frame components assemble in minutes.
- Outer frame folds down for compact, convenient shipping to your front door.
- California King size measures 5 x 83 x 71 inches (HxLxW).