Hardside Waterbed Mattress models vary from Extra Firm to full motion. Select the brand of waterbed mattress you want from above and then you can look at individual waterbed mattress ratings features you are looking for. 

Selecting the best waterbed mattress for you is important. You will be sleeping on it for many years.

Some experts advise getting a waterbed mattress with a similar waveless rating to what you have been sleeping on if you were happy with your current waterbed mattress. Generally firm waterbed mattresses are listed as Waveless. If these are too firm, the semi waveless waterbed mattresses may be what you are looking for.
A Boyd Memory's hardside waterbed mattress offers premium value in wood frame mattresses for waterbeds. They have tethering, air cushion reinforced corners, supple 20 mil vinyl, and an extensive variety of fiber and lumbar configurations.

The Lumbar Supreme hardside waterbed mattresses has a slightly thicker 24 mil vinyl, stretch tethering, Quadra Tech reinforced corners, high loft thermal bonded fiber. This is the absolute best Boyd has.

A Fiber waterbed mattress offers a great value in wood frame mattresses. These affordable mattresses feature tethering, air cushion reinforced corners, supple vinyl, and a wide array of fiber and lumbar configurations.

The Boyd Memorys 4 Dual waterbed mattress has two separate bladders making one mattress. This allows individual temperature ranges for two sleepers.