An alpine touring heel unit is provided which comprises a base for mounting the heel unit and an upper portion with a heel connector. The upper portion is slidably engageable with the base for movement by a user into a downhill position and a touring position spaced rearwardly from the downhill position for disconnection of the heel connector. Complete movement in at least one direction between the downhill and touring positions may be actuated by a single motion by the user. Also provided is a heel unit movable between downhill and touring positions which comprises a heel support pivotally coupled to the heel unit. Also provided is a heel unit comprising a post and a body with a heel connector, the body being coaxially mounted on the post and rotatable between opposing lateral release positions and further containing a biasing device mounted outside of the body. Also provided are kits comprising a heel unit of this invention and a toe unit which functions independently from the heel unit.