How well does this mattress isolate motion for couples?

Well, scoring 8.2/10 for motion isolation. Each of the 800 coils is wrapped in its own fabric pocket, so they compress individually instead of moving as one connected unit, and the 3.5-inch comfort layer absorbs the rest. A partner turning over barely registers on your side. Some couples even pair two Twin XL units side by side to build a split king with minimal gap, which several owners report works smoothly.