Well you are right and there should be more sizing info on the site. I am 5'11 and about 175 lbs and the Large fits me perfectly. The XL grades up 1" in length and arm length and down 1" for size M. All of these jackets are somewhat custom and made from a numbef of different highly technical fabrics...
This jacket is the BOMB! Ask the folks in Utah at Windzup/Ozone! http://www.ultranectar.com/snowkitejacket/
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Wasson, Heinekin, Pasquali, The Koch Brothers, and do not discount a couple of locals. There better be plenty of course racing to satisfy these fellas. It will be good to line up against Damo and Kent as well. Berney (Brian Lake is no slouch either).