I understand the concept of dead air space insulation, hence double walls; however, I have not seen it (literally) in wall tents. If one has a tight rain fly over a canvas wall tent then there is a limited dead air space. I can say that a wall tent with a fly on is MUCH warmer than one with out.

The Alaknak is single wall all way around; however they do make a fly for it which would create some dead air space. Regarding condensation, at least as far as design goes the Alaknak has a air vent at the top of the cone and on the sides.

EKM