A quote from Bell, one of the largest safety helmet manufacturers:
[QUOTE
Joe Rocket Speedmaster Carbon Helmet
Highlighted by carbon fiber inside and out, the Joe Rocket Speedmaster Carbon helmet does little to hide its raw performance nature. Laid out in a 4 x 4 weave, the aerodynamic carbon fiber shell is both exceptionally light and strong while giving an unmistakably sporty look. And when the heat rises, vents in the chin, forehead and back pull air into the QWICKDRY™ interior. Still priced under the competition, the Speedmaster Carbon gives the sportbike rider their own little bit of racing exotica.
- Ultra Lightweight Full Application 4 x 4 Carbon Fiber Weave Shell ][/QUOTE]
4 x 4 is definitely a carbon fiber weave.
Not positive on the Seahawk helmet, but I did hear that it was carbon fiber composite.
Larry