If you're in search of a harness with a built-in cock ring, then this harness would be ideal for you.
Put the harness on and insert your penis in the metal ring, for most people it is best to insert the penis before an erection is reached - and notice the extra arousal during sex.
As an extra feature, this harness has a small pocket on the back side, making it possible to place a butt plug firmly in the harness, and in that way you gain an even more powerful stimulation. It functions by placing the foot of the butt plug firmly in the pocket, therefore it is important to select a butt plug with a "foot" or stopper.