Yep, all sintra. I really like it, it's super easy to deal with. Cuts nicely, sands and files easily, glues well, takes paint well. A layer of filler primer before the metallic paint filled in the porosity on the edges quite nicely, too. It's lightweight, so it should be comfortable to wear, and sturdy enough--especially since most of it has two layers for at least some portion of the part--that I hopefully won't have to be too careful while wearing it. Since I paid $2 per 4'x10" piece it was super cheap too, I've used less than two pieces so far!