Designed and built for big ascents and technical descents, the Dynafit TLT6 Performance CL Ski Boots are not for the faint of heart. These expert level touring boots are built for the serious, committed, and sometimes crazy ski mountaineer. They're not only capable of skiing in technical terrain they kind of insist on it. The Pebax shell resists extreme cold and stands up to the conditions you'll find in the wild and rugged alpine, while a carbon fiber and Pebax cuff with a driving rear spoiler deliver security and power when every turn counts.But all this strength and capability shouldn't be intimidating, because these boots come equipped with foot loving Custom Light liners, which are anatomically shaped and moldable to every curve of your feet. Lightweight warmth gets a boost with additional felt and aluminum along the bottom of the boot to reflect heat. The newly re designed Ultra Lock System 2. 0 is designed for more fluid transitions with a shape that eliminates snagging. The downhill booster tongue can be inserted before the descent to boost the stiffness of the boot, while the Ultra Lock Strap eliminates excess space between the tongue of the boot and shin bone, giving the boots the ability to drive skis with power and precision. The sole of the TLT6s is designed with mountaineering in mind with an extra durable material in the heel and toe that can be resoled, if necessary. The forward insert can be adjusted between 15 and 18 degrees with a forward lean insert, while instep buckle features a micro adjustable design, allowing for an even more precise fit.