If you have a Cal king Hardside waterbed that is in need of a new mattress then you will love this mattress kit. The mattress is a 95% waveless which means it has about 3-4 seconds of slow movement which is very little when compared to other water mattresses. It is f has 6 layers of super soft fiber with extra fiber in the mid section which will help you sleep more level. Sleeping more level is a big plus for increasing comfort. All the fiber is tethered together to help prevent shifting. This combination will give you a very comfortable sleep and that is why it is our best selling mattress. The mattress is manufactured by United States Water Mattress who has been manufacturing the highest quality waterbed products for over 40 years right here in the U.S. This mattress kit also includes a heavy duty 12 mil safety liner which is the highest quality available. You will also receive the Touch Temp digital waterbed heater that includes an easy to use push button control and the heater pad so your water mattress stays nice and warm in the winter at the 70-99 degrees in temperature. This kit also includes our Electric Drain pump which makes it easier to help drain any waterbed, We also included a fill kit and a bottle of 4oz bottle waterbed conditioner so it will be easy to install your new mattress. This mattress kit is the perfect replacement for California King hardside waterbed platforms that are 72 x 84. If you have any questions feel free to contact Mattress Covers Amazon Store any time Thank-you for looking at our products