Hi Tiran,
Good find on the website. I don’t know which material is on our boards (I have a Textreme FW STB too), and Craig may be able to tell you. However, I do work with composites professionally, so I will go ahead and suggest you want to order a yard of the HS material, which is “High Strength” and standard stiffness. I believe the boards likely use 160 gsm (gram per square meter) material since that is a appropriate and economical weight for a board laminate. (Don't order the +45/-45, BTW)
It could be 80 or 100 gsm, but only Cobra (or Craig) will know for sure.
Any of the weights (80, 100 or 160 gsm) will be fine for a repair since you or your shop will be feathering in the patch (making it tapered in thickness) with some overlaps. The 160 will give a little more thickness which is good when finish-sanding it.
Done carefully, the repair should look and work fine. Good luck!
Dimitri