How well does this mattress isolate a partner's movement?

Strongly, at 8.6/10. All 1100 coils are individually wrapped so each compresses on its own, the memory foam dampens disturbance on contact, and the dense latex layer absorbs more. A partner climbing in or shifting barely registers on your side. Because the bed is also lively enough to reposition on easily, you get low motion transfer without the dead, hard-to-move feeling some firm beds have.