Helly Hansen have had a similar jacket since Jan 2006 - very fine PU coating that makes the fabric effectively waterproof - called the Mars!
Here's a pdf from back then. I've had one a couple of years; the fit is much closer than the Hydrogen sample I tried on in a TNF outlet - especially in the arms (which are almost too tight for me but I'm not a Scando cross country ski champion afterall!)
It's incredibly light - I think I made it around 75g on the kitchen scales - and showerproof but the sweatiest windshirt I own and I'm not to confident about it's durability either. I pack it when I can't really see myself needing a windproof or a waterproof 'just in case' and have hardly worn it. I'd expect the TNF offering to be very similar.
John
Posted: 13/08/2009 at 17:37