Heel unit (10; 110) for a sliding board binding, in particular for a touring binding, comprising: - a base (12; 112) with a fastening arrangement (14; 114) for fastening to a sliding board, - a binding body (16; 116), which is rotatable relative to the base (12; 112) about a release axis of rotation extending orthogonally to a sliding board plane, - coupling means (18; 118) arranged on the binding body (16; 116), which are designed to engage with a heel section of a sliding board boot in order to hold the sliding board boot on the sliding board binding in a downhill position of the sliding board binding, wherein in the downhill position the coupling means (18; 118) protrude from the binding body (16; 116) in a longitudinal direction (x) of the sliding board, in particular in a forward direction of travel, from the binding body (16; 116), and - an Mz release mechanism (26, 28, 30, 38, 40, 50; 126, 128, 130, 138, 140), which is designed to preload the coupling means (18; 118) into the downhill position in such a way that, in the downhill position, when a force exceeding a predetermined release force acts on them, they disengage from the sliding board boot and, via a rotational movement of the binding body (16; 116) about the release axis of rotation, move from the downhill position into a release position, wherein the Mz release mechanism has a spring arrangement (30, 38, 50; 130, 138) with a spring means (30; 130) which determines the predetermined release force, and wherein the Mz release mechanism (26, 28, 30, 38, 40, 50; 126, 128, 130, 138, 140) comprises a cam body (40; 140) arranged on the binding body (16; 116), which is designed to engage in a cam follower manner with a counter-contour (28; 128) of a cam surface (26; 126) provided on the base (12; 112) in the release position, characterised in that the spring arrangement (30, 38, 50; 130, 138) is designed to exerting a tensile force on the cam body (40; 140) in order to pull it into cam follower engagement with the counter-contour (28; 128) of the cam surface (26; 126). - a base (12; 112) with a fastening arrangement (14; 114) for fastening to a sliding board, - a binding body (16; 116), which is rotatable relative to the base (12; 112) about a release axis of rotation extending orthogonally to a sliding board plane, - coupling means (18; 118) arranged on the binding body (16; 116), which are designed to engage with a heel section of a sliding board boot in order to hold the sliding board boot on the sliding board binding in a downhill position of the sliding board binding, wherein in the downhill position the coupling means (18; 118) protrude from the binding body (16; 116) in a longitudinal direction (x) of the sliding board, in particular in a forward direction of travel, from the binding body (16; 116), and - an Mz release mechanism (26, 28, 30, 38, 40, 50; 126, 128, 130, 138, 140), which is designed to preload the coupling means (18; 118) into the downhill position in such a way that, in the downhill position, when a force exceeding a predetermined release force acts on them, they disengage from the sliding board boot and, via a rotational movement of the binding body (16; 116) about the release axis of rotation, move from the downhill position into a release position, wherein the Mz release mechanism has a spring arrangement (30, 38, 50; 130, 138) with a spring means (30; 130) which determines the predetermined release force, and wherein the Mz release mechanism (26, 28, 30, 38, 40, 50; 126, 128, 130, 138, 140) comprises a cam body (40; 140) arranged on the binding body (16; 116), which is designed to engage in a cam follower manner with a counter-contour (28; 128) of a cam surface (26; 126) provided on the base (12; 112) in the release position,