Does this plush tight-top mattress isolate motion for couples?

Yes, motion isolation scores 9.0 out of 10. A double spring system does the work: 1800 pocketed coils that each compress independently, plus a micro-coil layer for a second tier of fine isolation. With more independent contact points than most beds, it localizes a partner's movement well, so a restless sleeper beside you is unlikely to wake you. For a lively, responsive hybrid this is strong motion control, close to what dense all-foam beds achieve.