How well does this firm mattress isolate motion for couples?

Well, even without a memory-foam damping layer, scoring 8.2 out of 10. All 1050 coils are sealed in individual fabric pockets, so each compresses on its own and a partner's movement stays local rather than rolling across the bed. We measured peak transfer in the 3.1 to 6.4 m/s2 range, settling in about a second, calmer than a typical mattress. For a firm, springy build the pocketed coils carry the isolation cleanly, so a restless partner is well contained.