Per Brian Nystrom:
Perhaps so, but most dry suit manufacturers don't do that, possibly due
to size restrictions on waterproof zippers. I won't buy a dry suit that
doesn't have a relief zipper of some sort.

I ordered my Kokatat with a relief zipper because everybody else was so
enthusiastic about the feature.

If I had to do it over again, I wouldn't order one.

Reasons:
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1) I can't see using it unless I'm standing on dry land. Given that, by
the time I need to use it, I'm so soaked with sweat that it's another
kind of relief to peel off the arms and torso anyhow.

2) When windsurfing, sometimes it gets in the way of the harness line
when I'm trying to re-hook.
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OTOH, if I were doing it again, I think I'd order the OS Systems product
instead because it looks like a off-the-shelf suit would fit me instead
of having to pay more for a semi-custom.
--
PeteCresswell