Used mostly by slimmer men or men with large backsides. A single vent is traditional gives sophistication and elegance to a suit jacket.
Double Vent
More commonly used and is the best choice of vents for fitted jackets.
No Vent
No vent jackets offer a slimmer look, sleek and clean. It is best known in Tuxedos or formal jackets. Even though a no vent jacket gives class and makes a man look slimmer it does have a huge drawback, with no vent there is very little room to for a man to move, restricting motion. If you’re not concerned with your mobility being hampered than no vent jackets will be of no concern.