From what I can tell, this is more a double walled tent than single wall, it is just that the "fly" is attached to the "body"  Like my current tent, the "body" on the Flash is a mesh material.  The "fly" rides a couple inches above the "body" (see image).   The one consistent comment by reviewers is how much better this tent is at deling with condensation, given its ventilation.  In fact it may be less than ideal for winter camping as it will tend to be cooler.

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Here is one comment by a reviewer, speaking about the external pole design.

Quote:

But the other benefit of this hanging design comes into play when it rains. All nylon rainflies are going to stretch and sag when they get wet. If the pole structure is in between the fly and body… as the fly sags it gets closer to the body. If they get close enough to touch it will reduce airflow and create condensation and potential drips inside your tent. When the poles are on the outside and the body is hanging from the fly… as the fly sags the body sags with it maintaining it’s distance. This is a design featured on much more expensive tents – such as anything from Hilleburg – and it’s a great addition to the Flash 2 UL.

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