An old post so apologies. How did they say to measure as I bought one quick as I was in a rush. It came today and not sure I will get it over my headMy experience was that I measured multiple times and ordered one for my old neo suit. I think I paid ~ $20 shipped or something (I got other stuff so I'm not sure).
It arrived and felt tight, but I measured the way that they said so I tried it on. The very 1st time trying it out popped at the seam and was useless. I reached out to Seaskin multiple times never got an answer. I should have called. It's been the only thing I've ever gotten from them and regretted.
YMMV... just sharing my experience
I just measured under my adams apple like I would a drysuit. I'm wondering if I will need talc or jollop to get that on