The match style called 'sundome,' or 'kime,' is one in which the contestants, as a general rule, should stop a punch before it hits the opponent's body deeper than his/her skin to prevent injury.
打撃による怪我を防ぐため、原則相手の皮一枚で止める「寸止め」もしくは「極め」と呼ばれる試合形式。