noun
bantamweight
Refers to the bantamweight class in boxing and other combat sports. The term is a direct loan from English 'bantam' plus 級 (class).
彼はバンタム級のチャンピオンだ。
He is the bantamweight champion.
次の試合はバンタム級で行われる。
The next match will be held in the bantamweight class.
From English 'bantam' (a small breed of chicken, used figuratively for small fighters) + 級 (class).