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Sonno Bed is all foam, meaning it should perform very well in the motion transfer test (and it does). I did this test on the firm side, but I expect the medium side will perform equally well.
Why care about motion isolation? It really matters if you're sleeping with a partner. If either of you toss and turn throughout the night, having a mattress that considers motion isolation is essential. Sonno Bed performs well, and thus is a good option for couples in my mind.
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