Jussi Nikander wrote:

What are the suits made of, does anyone have that reference?  If it gets
cold enough, does it get brittle?

Doesn't really matter. The people inside would be dead from the cold anyway.

Not in a Batman: TAS episode.  And not if they were lead characters
in BGC.  Look at what Largo did to Priss.  She would have bled to death
in that spiffy new suit of hers without script immunity.