The present disclosure relates to a height adjustment arrangement (100) for an ear cup in a hearing protector unit, wherein the height adjustment arrangement (100) comprises an elongated member (130) and a tubular holding member (110) connected to the elongated member, wherein the holding member provides a substantially hollow interior (111). The height adjustment arrangement further comprises a clamping member (120), wherein the clamping member is arranged to be moved from an unlocked position, in which position relative movement between the elongated member (130) and the holding member (110) is enabled, to a locking position, in which position relative movement between the elongated member and the holding member is prevented. The holding member (110) comprises a first locking member (114), wherein the second end of the holding member is provided with two flanges (115a, 115b) tapering in a direction towards the clamping member, and wherein the first locking member and the flanges are axially separated. The clamping member comprises a hollow interior with a tapering part, which tapers in a direction away from the holding member, and a second locking member, wherein the tapering part and the second locking member are axially separated.La présente invention concerne un agencement d'ajustement de hauteur (100) pour une oreillette dans une unité de protection de l'ouïe, l'agencement d'ajustement de hauteur (100) comportant un organe de forme allongée (130) et un organe de maintien de forme tubulaire (110) connecté à l'organe de forme allongée, l'organe de maintien de forme tubulaire fournissant une partie intérieure sensiblement creuse (111). L'agencement d'ajustement de hauteur comporte également un organe de serrage (120), l'organe de serrage étant agencé pour être déplacé depuis une position déverrouillée, dans laquelle un mouvement relatif entre l'organe de forme allongée (130) et l'organe de maintien (110) est autorisé, vers une position de verrouillage, dans laque
