I got the MT500 PTFE jacket, which is the same mebrane. It's breathable, but by crikey it's hot. I just wear a merino base under it and I'm fine. I am a sweaty chuffer though
PP – Good advice above. Let the negative out and up they popped. I reset teh pressures and went for a spin and they are back to how they should be again.
If they have another floppy moment I'll strip them down, in the meantime I'll leave well alone.