If you're a free rider who loves to charge up the hill in lightweight comfort but wants to rip back down that untouched face with power and precision of an alpine downhill boot - then the Synchro is right up your alley. Easy on the uphill The Synchro's shell is built with Grilamid to provide strength to the boot without adding weight. Reinforced with carbon, it's LA Sportiva's stiffest ever boot, rocking up at 125 flex-index. Switch your boot into walk mode to open up its 50-degree range of motion, La Sportiva's Double Power Tongue offers great flexibility from stride to stride. If you're out of the binding and need to clamber over ice and rocks - fear not, the Synchro has a Vibram sole to provide awesome traction across uneven surfaces. Powerful downhill performance Tune the downhill performance of the Synchro with the choice of 12, 14 and 16-degree forward lean options. By closing the 4 easy-grip Pegasus Plus Buckles to wrap the two-layer double tongue around your lower leg, the boot performs exceptionally in delivering your power to the ski. Inside, you've got an Overwrap Ultralon liner that offers warmth and comfort for downhill skiing. If you're looking for super-stiff downhill performance from your AT boots - then you've come to the right place. THE BEST BITS... Solid 125-flex Wide 50-degree range of motion in walk mode Innovative dual tongue for easy walking and aggressive forward flex Wider 102.5mm last Stable Vibram boot sole AT binding compatibility 4 Oversized micro-adjustable buckles Warm, comfortable Ultralon Liner Multiple-degree forward lean spoiler Not sure about which ski boots to choose? Check out our Ski Boot Buying Guide for a full rundown.