A male bra (also known as a compression bra, compression vest, or gynecomastia vest) is a brassiere worn by a man. Adolescent boys and middle-aged men sometimes develop breasts (gynecomastia). Although there are options for treating gynecomastia, some elect surgery to reduce their breasts or wear a male bra, which typically flatten rather than lift. Other men wear bras for cross-dressing, for sexual purposes such as transvestic fetishism or feminization, or as a form of submission to their partner.
Additionally, some male athletes – more specifically runners – may choose to wear a sports bra under their shirts in order to prevent a common medical condition called jogger’s nipple, also known as nipple chafing. This condition is caused by excessive rubbing of wet sweat-soaked material over one’s nipples. In an episode ‘Seinfeld,’ titled ‘The Doorman,’ Kramer invented a male bra, which he called a ‘bro,’ for Frank Costanza, who was said to have very large breasts. Frank initially decided to market the invention, but disagreed on the name, instead wanting to call it a ‘Manssiere.’
The Daily Omnivore 