The 4-QUATTRO XT is the lightest GripWalk hybrid ski boot in its class. A low stand height and flex index of 130 provide incredible power and performance, making this boot ideal for expert skiers and snow professionals. The shell and cuff are made from Grilamid Bio, produced from renewable, plant-based sources. The shell incorporates an over-injected carbon insert for enhanced precision, energy transmission, and torsional rigidity. The RECCO integrated Booster® Strap increases downhill performance and reduces pressure on the shin. The new Alpine Axial Hybrid provides a classic overlap construction allowing easier entry into the boot and enables excellent power transmission and unparalleled control. The Presa® sole has an ergonomic design that guarantees excellent grip when walking and is compatible with GripWalk certified downhill or ski touring bindings. Power, precision, and sustainability come together to make the 4-Quattro XT the perfect boot for hard chargers, both on and off piste. Grilamid Bio® shell with an over-injected Carbon Grilamid® LFT insert for high torsional rigidity.