Does this firm foam mattress isolate motion well for couples?

Yes, motion isolation scores 7.7 out of 10 with measured peak motion around 3.28 m/s2. As an all-foam bed with no springs to carry vibration, a partner climbing in or rolling over barely reaches your side, and the little that registers dies out in roughly half a second rather than rippling across. Even at extra-firm tuning the solid foam core absorbs movement on the spot, making it a quiet choice for light sleepers sharing a bed.