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Soft-sided waterbeds consist of a quilted mattress cover with an internal foam frame that holds a fluid suspension mattress. The foam frame is made with four separate pieces of foam that form the walls or edges of the waterbed mattress cover. The top of the foam edges can become compressed over time and are easy to replace: Just unzip the top of the mattress cover, remove the flat foam-edged piece and replace it with a new one.
Things You Will Need Measuring tape Waterbed hose attachment References (3) Assembling a Softside WaterbedWaterbed Gallery: Softside Waterbed Assembly InstructionsWaterbed Parts Online: Take Softside Bed Measurements Photo Credits Thinkstock Images/Comstock/Getty Images