lateral guiding device of a fixed ski boot, at its front end, on a ski such as cross-country skiing

This invention relates to a lateral guide device for a ski boot fixed to its front end, on a ski such as skiing and whose heel is free to move at least vertically, having a rib longitudinal guide. this device is characterized in that the longitudinal guiding rib 1a presents in succession, from front to back, a decreasing height in a first section cooperating with the a region of the sole 4 corresponding to toes, then a substantially constant reduced height in a second section B cooperating with the area of ​​the sole corresponding substantially to the head of the metatarsals, and increasing height in a third section C.