How good is this mattress at isolating a partner's movement?

Exceptional, scoring 9.6/10, among the best in any format. Three layers earn it: every coil is individually pocketed so it compresses on its own, a separate micro-coil layer adds a second independent spring tier for finer isolation, and the memory foam absorbs the rest on contact. Disturbance settles in about one second. If you share with a restless partner, their tossing stays firmly on their side.