Isabella Cirrus 400 Air Awning

When I first read this, I was confused because all the air awnings we have had - and I have seen - usually have a foam pad against the side of the van and, provided it is pegged down slightly under the van, normally gives a good seal - and if not the additional poles that can be bought as an extra, help to some extent.  That said, I have never needed to use ours.

I have just looked on-line and the Isabella does indeed have inflatable poles against the side of the van which I find strange because they are never going to give a good seal around the skirt track - unless you do as advised on one their instructions sheets and let some air out. Even then - as you say - I can't see it being satisfactory and I'm surprised given the usual quality of Isabella products that they have opted for this design feature.

However - does it really matter? Surely the gap is so small that it can't be that much of an issue in practice. Awnings are never going to be completely airtight.