Ideally, a 6mm wedding band is the perfect size for a man. It is not too thin or too thick. Therefore, most wedding bands for men are around 6-8 mm. However, some bands also go up to 12 mm in thickness. It comes down to your preference. Generally, rings with a thickness of less than 4 mm look too delicate on a man’s finger. Therefore, a thickness between 4-12 mm can be selected.