I gotta say, of course he had to wear "two" arm guards. "One" of those is worthless. The prop is a single armguard. Real armguards are at least four times as wide. Notice the pro the image below, his armguard is about the same overall width, certainly the same proportionally. Renner has larger forearms.

I have this one. It's 5 inches wide.


If anyone tells you that "real" archers don't need them, they're just posturing. Pros wear them, hunters wear them (prevents catching on winter jacket sleeves). The author is full of shit.


It's a movie prop for effect, like Loki's staff.