a four,buckle ski boot for intermediate to advanced backcountry skiers. The Zero G Tour weighs 1,500 grams (for a size 26.5) and features an uber,wide 55,degree range of motion, so gliding up the skin track feels like a breeze. And yet, when you lock down the four buckles for the descent, the 110 flex turns the Zero G Tour into a great downhill performer. Customization Liner: Light - Sanitized® lining and footbed Customization Shell: PU - Quick Instep Shell: PU - Quick Instep Cuff: PP Buckles: 4 Micro Adjustable with Walking Lock Out Forward Lean: 12.5° (Default, 13.5° After Adjustment) LAST: 99 FLEX INDEX: 110 VOLUME: MV TOURING