Details Reviews (0) Specs PERFORMANCE YOU DEMAND. COMFORT YOU DESIRE. In the back of the cuff we also wanted to place an additional innovative element.With the Flex Adjuster, just unscrew the upper screw of the system to obtain a softer flex: by removing the lower screw the boot will become even softer.With this simple method we give consumers an additional element of customization. Width (Appx.): Unk. Flex Index: Unk. Speedmachine 100 Ski Boot 2023/2024|FCSki.Com|In Stock