Corvo Attano Rat Mask

How is this wearable? Does it have like straps or something like that?

i bought one like this but it was a thin and rubbery latex material. is this one a hard mask or does it hold it shape

when you say poor visibility in the right do you mean can't see at all or it is just blurry or somewhat diffucult to see through?

Is it possible to have this mask fitted with the optics as seen in the game?