Abstract: The ski boot can be adjusted in length and/or width. The outer boot is divided into at least two shell parts, preferably into four shell parts (1, 2, 3, 4). The multi-part outer boot is individually adjustable at the front and back and has a predominantly supporting function. Insulation and sealing against moisture are ensured by a special, stretchable inner boot which is fitted to the foot size simutaneously with the adjustment of the outer boot.