I'll start with this vid.  Definitely speleothems in the background of this video, I've checked several times in the name of research.
Not sure about the thermal properties or tog ratings of the new alleged 'Petzl & Warmbac' speleosuits shown (I may have misheard the maker's name there, my interpretation of the sound) but technology moves on.....  Other views & vids welcome.

https://www.youtube.com/watch?v=dCd8k8OJ6_Q