As you can see from the pictures the mattress is sealed and rolled in plastic. It comes with a little cutter to cut the plastic, very helpful tool. As soon as the plastic is cut the mattress will start to expand, so make sure it is on the frame ready to put into position. The one pictured is a king size. It fit nicely on my box springs. It is a thick mattress and your body sinks into the memory foam. It’s so very comfortable!