A toe-piece of a ski binding for ski mountaineering has a base, a first jaw, a second jaw, an activating lever, a joint, a housing, and elastic means. The first jaw is provided with a first guide, and the second jaw is provided with a second guide. The activating lever is rotatably coupled to the base. The joint is activatable by the activating lever, which includes a first sliding element slidably coupled with the first guide and a second sliding element slidably coupled with the second guide, so that the activation of the activating lever causes, via the joint, the rotation of the first jaw and the second jaw. The housing is borne by the base. The elastic means are arranged in the housing so as to push the joint to wedge against the first jaw and the second jaw.

A heel unit including a base comprising a fastening arrangement for fastening to a gliding board, a binding body, and coupling means arranged on the binding body. The coupling means engage with a heel portion of a gliding board boot in a downhill position of the gliding board binding to securely hold the gliding board boot on the gliding board binding. The coupling means protrude in a longitudinal direction from the binding body in the downhill position. The heel unit includes an Mz release mechanism to preload the coupling means into the downhill position so that, in the downhill position, the coupling means are freed from engagement with the gliding board boot upon action of a force exceeding a predetermined release force, and so that the coupling means move from the downhill position into a release position via rotational movement of the binding body about the release axis of rotation.

A toe-piece of a ski binding for ski mountaineering has a base, a first jaw, a second jaw, an activating lever, a joint, a housing, and elastic means. The first jaw is provided with a first guide, and the second jaw is provided with a second guide. The activating lever is rotatably coupled to the base. The joint is activatable by the activating lever, which includes a first sliding element slidably coupled with the first guide and a second sliding element slidably coupled with the second guide, so that the activation of the activating lever causes, via the joint, the rotation of the first jaw and the second jaw. The housing is borne by the base. The elastic means are arranged in the housing so as to push the joint to wedge against the first jaw and the second jaw.

A heel unit including a base comprising a fastening arrangement for fastening to a gliding board, a binding body, and coupling means arranged on the binding body. The coupling means engage with a heel portion of a gliding board boot in a downhill position of the gliding board binding to securely hold the gliding board boot on the gliding board binding. The coupling means protrude in a longitudinal direction from the binding body in the downhill position. The heel unit includes an Mz release mechanism to preload the coupling means into the downhill position so that, in the downhill position, the coupling means are freed from engagement with the gliding board boot upon action of a force exceeding a predetermined release force, and so that the coupling means move from the downhill position into a release position via rotational movement of the binding body about the release axis of rotation.