Ana amfani da kalmar "Junior Middleweight" a fagen wasan dambe don komawa ga nau'in nauyi, yawanci ga ƙwararrun 'yan dambe, waɗanda ke faɗuwa tsakanin sassan matsakaicin nauyi da welterweight. Gabaɗaya, sashin ƙananan matsakaicin nauyi yana da iyakacin nauyin kilo 154 (kilogram 70). Dan damben da ya fafata a wannan ajin nauyi ana yawan kiransa da "junior middleweight" ko "mai matsakaicin nauyi."