Hi KG123,
The Celebrate is a latex / polyfoam hybrid rather than an all latex mattress like the ones in the “Natural” or the “All Natural” line. It’s been mentioned a few times on the forum and a forum search on Celebrate (you can just click this) will bring up a few references to it including the details of its layering.
The PLB Hybrid 3.0 line uses a bonded polyfoam / latex core (90% poly / 10% latex) which is a less costly material than the Talalay latex cores used in the Natural line (which is why they are lower priced). You can read more about the bonded core in post #6 here.
Phoenix