Heel unit of a touring binding which is adjustable between a downhill position and a walking position, wherein the heel unit is configured, in the downhill position, to be in engagement with a heel portion of a sliding board boot in order to fix the sliding board boot on the touring binding and to release the heel portion of the sliding board boot in the walking position so that the heel portion of the sliding board boot can lift off from the heel unit, and wherein the heel unit comprises: • a base which is provided for mounting on a sliding board, • a binding body which is mounted on the base so as to be rotatable about an axis of rotation orthogonal to a sliding board plane and is adjustable at least between a first rotational position and a second rotational position, and • a climbing aid which is configured to support the heel portion of the sliding board boot at least at a predetermined height above the sliding board plane and which is adjustable between a first position and a second position, wherein the downhill position of the heel unit is realised if the binding body is put into the first rotational position and the climbing aid is put into the second position, wherein the climbing aid is pivotally mounted on the binding body about a climbing aid pivot axis for adjustment between the first position and the second position, wherein the climbing aid is formed in one piece and wherein the climbing aid has at least a first and a second support portion (42A, 44A) for supporting the heel portion of the sliding board boot, wherein the climbing aid is configured, in its first position, to support the heel portion of the sliding board boot in the first rotational position of the binding body by means of the first support portion and to support it in the second rotational position of the binding body by means of the second support portion, characterised in that the binding body is rotated in the second rotational position relative to the first rotational position by approximately 60° to approximately 120°, in particular approximately 90°, about the rotational axis orthogonal to the sliding board plane. • a base which is provided for mounting on a sliding board, • a binding body which is mounted on the base so as to be rotatable about an axis of rotation orthogonal to a sliding board plane and is adjustable at least between a first rotational position and a second rotational position, and • a climbing aid which is configured to support the heel portion of the sliding board boot at least at a predetermined height above the sliding board plane and which is adjustable between a first position and a second position, wherein the downhill position of the heel unit is realised if the binding body is put into the first rotational position and the climbing aid is put into the second position, wherein the climbing aid is pivotally mounted on the binding body about a climbing aid pivot axis for adjustment between the first position and the second position, wherein the climbing aid is formed in one piece and wherein the climbing aid has at least a first and a second support portion (42A, 44A) for supporting the heel portion of the sliding board boot, wherein the climbing aid is configured, in its first position, to support the heel portion of the sliding board boot in the first rotational position of the binding body by means of the first support portion and to support it in the second rotational position of the binding body by means of the second support portion, characterised in that the binding body is rotated in the second rotational position relative to the first rotational position by approximately 60° to approximately 120°, in particular approximately 90°, about the rotational axis orthogonal to the sliding board plane. wherein the climbing aid is pivotally mounted on the binding body about a climbing aid pivot axis for adjustment between the first position and the second position, wherein the climbing aid is formed in one piece and wherein the climbing aid has at least a first and a second support portion (42A, 44A) for supporting the heel portion of the sliding board boot, wherein the climbing aid is configured, in its first position, to support the heel portion of the sliding board boot in the first rotational position of the binding body by means of the first support portion and to support it in the second rotational position of the binding body by means of the second support portion, characterised in that the binding body is rotated in the second rotational position relative to the first rotational position by approximately 60° to approximately 120°, in particular approximately 90°, about the rotational axis orthogonal to the sliding board plane.