A mechanism for attaching a boot to a ski with the heel end of the boot being height adjustable. The toe end portion of the boot is pivotly attaching to the ski. A pair of members engaged to the heel end portion and the ski respectively engage each other in a manner to provide height adjustability of the heel end of the boot. A track on either of the boot or the ski is slidably engaged by the respective member. One of the members has an inclined serrated surface which engages a serrated surface of the other member for adjusting height. Alternatively, one of the members has an inclined surface, and height adjustment is achieved by a threaded rotatable member on one of the members which threadedly engages longitudinally spaced indents or other formations in the other member.