The cuff alignment setting adjusts the upper cuff of the Apex ski boot, aligning the upper cuff with your leg’s angle of entry into the chassis. If you have a slight bowleg or knock-knee you will want to adjust the cuff to align with your lower leg shape. A tool to make this adjustment (an Apex hex wrench) is included with each pair of boots. You can also use a hex wrench of your choosing to complete this adjustment. Please also view the video here: https://www.apexskiboots.com//video-gallery for further instructions on how to make this adjustment.