This jacket is frickin awesome.  Ever had to wear a shell cause it was windy/snow was falling/very cold etc. but you didn't want to because you knew you would sweat?  This thing breathes like a shirt does, cuts the wind, and snow falls right off.  Anything short of pouring rain I would bring this.  It weighs 4oz and fits in your pocket.  If I had this in Canada on the silverhorn I would have brought this only, nothing else.  If I had this on the Presidential traverse I would have brought this with a paclite in my pack as a backup.  I would have worn this 90% of the time on presi instead of sweating it up in my 3-layer shell.  It is a very supple thin fabric, not stiff like a shell, it's more like a shirt than anything else.

 Paclite shell 11oz + Houdini 4 oz = 15oz

Gore-Tex XCR shell = 22oz