They are well tinted, while outside It's like I'm wearing my sunglasses and unless there is a direct light and you are close enough (and even then its hard to see) you can't really see inside it. I just mounted mine in with tape after cutting to shape. For an ODST helmet, you may need to have a clear visor in place before you use the flex-able visor to help give it shape.
If anything, try searching etsy for a visor that would be tinted already.
https://www.etsy.com/shop/WelshCreations?ref=l2-shopheader-name may be a good starting place.