A boot for a roller skate system has a three-point fastening system for fastening the boot to a rail. The three-point fastening system includes three fastening devices, wherein the first fastening device is arranged in a central position in the heel region of the boot, the second fastening device is arranged on an outer side in the ball region of the boot, and the third fastening device is arranged on an inner side in the ball region of the boot. The rail that can be mounted on the boot is also described.