Hi DeputyDawg,
Celsion is the old name for what is now called Talalay GL fast response. Pure Latex Bliss calls the same material Active Fusion fast response. It’s Talalay latex that has phase change gel added to it to assist with temperature regulation (see post #5 here). It comes in ILD’s of 15, 21, and 27. It would be comparable to a solid layer of blended Talalay in the same ILD in terms of softness. If it was convoluted it would also be comparable to a convoluted Talalay layer in the same ILD.
Convoluting can also have some benefit to increase airflow in material depending on how much the peaks of the convoluted layer are compressed with weight (whether the valleys or channels remain open) and the type of materials above the convoluted layer.
Phoenix