You should also look into Alpinestars & SixSixOne (661) upper body full armor. They're designed for motocross & ATV, and the big hits those guys take while riding.
I can vouch for the Aplinestars street bike wear. I took an off road adventure on my Yamaha FZ6 by accident a few years ago, went tumbling through the ditch at about 60 km/h. A little scuff on my helmet and textile jacket, and I got up good to go.
The jacket is really good shit but would be too much for snowboarding. I bet their moto-x stuff would be excellent.