Does this mattress sleep cool despite being plush?

Yes, cooling is its headline strength at a perfect 10, among the coolest hybrids available. Peak surface temperature stays in the 29 to 32 C range and settles lower overnight. Three layers do it: a graphite gel PCM comfort foam pulls heat from the surface, an inch of gel-infused foam carries it off, and a micro-coil layer plus 1800 pocketed coils move air freely through the core instead of trapping it the way solid foam does.