The Roadcrafter has a polyester lining, just as you'd find in any riding suit.
The Darien does not have a lining at all.
The polyester lining in the Roadcrafter does not make it any warmer to wear when it is hot outside, as one would think. Cooling is done via the zippered vents, not the Gore-Tex.
Maybe someone can post a pic of the insides of a Darien turned inside out. Its a disappointment. Other than that, I'd buy one.