a715a371_on__Hardside_Softside_Mattress__0
[1] d [2] c [3] A mattress with good motion isolation absorbs movement from spreading across the bed and keeps one's partner from being disturbed. Single bladder waterbeds perform poorly on this issue, while dual bladder models can perform fairly well. In addition, the motion of the bed causes sea sickness-like symptoms for about 3% of owners. [0] 
Motion isolation
Unbiased Waterbed Reviews and Ratings 2014 : Complaints, Advantages, Disadvantages and Comparison: Hardside Softside Mattress
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