So, to summarize ...
On the big jets, there are two pressure-vessel panes for redundancy, inner and outer. They're made of single-ply stretched acrylic (and if they're curved to fit the match the fuselage, I guess they could be called moulded, too). They're on condition, but there are two of them, so if one fails, the other other one still holds the pressure.
Turboprops are different.
Thanks, all - you've been helpful.