carbon fiber & a proprietary glassing method (future flex)
personal rant: the fact that most of these are being made in thailand or wherever makes the price absurd. if i told you what shop employees can get the gsi haydens for, you'd lose your mind.
i still don't get it - it ain't the carbon fiber that justifies the price....that's pretty standard stuff in my local guy's boards for a lot less money. and proprietary doesn't mean it should cost more unless you are licensing the technology from someone else. and if shop employees can get it for a lot less, than that means the cost really isn't that high to start with. maybe marketing hype and subsequent demand at play here?