Theo, by "bellies out", I mean that the top of the back rest is not perfectly straight, as it is on an Adirondack chair, rather, it has an outward contour which is very comfortable when you lean your head back. I personally find the Adirondack chairs very uncomfortable in that area. It may be poor posture on my part, I don't know, but if I lean fully back in Adirondack, my head tilts up and my mouth drops open, very unflattering. And uncomfortable.
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