Some men wear promise rings as pre-engagement rings. Others wear them as purity rings, and some men wear them to express friendship or for religious purposes.
When a promise ring is used as a pre-engagement ring, it is a sign that the man wearing it is in a committed relationship with someone who he eventually plans to marry. When it is worn as a purity ring, this is a sign that the man wearing it is waiting until marriage to become sexually active. The tradition of wearing a purity ring started in the United States, and these rings are also called abstinence rings or chastity rings.