Hi mike7,
You can read a little more about Talalay GL fast response in post #5 here. It is basically blended Talalay latex with phase change gel added to it to help give it a bit of an edge with temperature regulation compared to regular Talalay. Part of the reason for its intrduction I believe was also to “compete” with some of the gel memory foams at least in terms of peception because latex is already one of the most breathable of all the foam materials.
Sleep Like a Bear carries it (although they still call it Celsion) in all three ILD’s that Latex International makes available.
Mattresses.net also carries the Talalay GL slow response version as far as I know.
Phoenix