I think even a single layer of 1.6 HyperD is too much for them. We're having a really bad mosquito year, and after 2 nights out on hot still nights, no pad or underquilt, I haven't been bit through the fabric. I keep way away from the mesh though, I know they can get me there. I woke a few times to them buzzing behind my head, and laid very still to see what would happen, and no bites. There are different species of mosquitos though, so maybe elsewhere they have tougher proboscises?
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