What is man bra?

There is no such thing as a "man bra." However, there are garments designed for men with larger chests or for those who want to smooth out their chest area. These garments are typically called compression vests or compression shirts. They are designed to compress the chest area and provide support, similar to a sports bra for women. Some men may use these garments for medical reasons or to minimize the appearance of gynecomastia (enlarged breast tissue). They are also commonly used by athletes and bodybuilders for support during physical activity.