Originally Posted by jyasaki
Or try a fingernail test: Hypalon surface is usually a sort of rubbery feeling when picked with a fingernail, PVC is more plasticky.
Not 100% accurate, and a bit of experience helps, but cheap and fast.
Cheap chinese PVC is kinda rubbery and smooth.
The easiest way to tell is from the seams. Fraying = hypalon, melted goo out the edges = welded PVC.