Almost new Casper king mattress, medium firmness,12 inches thick. It's sold with bunkie boards (also new) and Marine Moon King mattress topper cooling pillow top. (see Amazon for further description of topper) You may not need it, because mattress is very comfortable without it. The mattress is in perfect condition and was barely used.
I have had questions on what the "Bunkie Boards" are. They are an alternative 2 inch board that serves as a support/base to a boxspring when the Mattress is high.