That dirty, little submissive is going to have to look you in the eyes once you strap this sturdy leather posture collar around their neck. You'll smirk as the sub tries to avoid eye contact by looking at the floor as you explain to her exactly what she did wrong and what she's going to have to do to make it right; she can't look down - the collar prevents it, as well as encouraging her to maintain a straight posture.
But don't worry - the collar is comfortable enough - as long as the sub does as she's told.