The S/Lab X-Alp Ski Boot is an ultralight alpine touring boot straight out of Salomon's lab of gram-counting ski geeks who found out that a good ski boot doesn't necessarily need a tongue or full cuff to ski well. Salomon achieved this tongue-less design by adding carbon to the cuff and making the spine completely out of carbon. As a result, the X-Alp checks in around two pounds per boot, and this model is the stiffest option available in the X-Alp series, making this boot a great choice for backcountry skiers who want to tour far and still have a decent downhill ride. Minimalist alpine touring boot for seriously adventurous skiing Carbon spine and cuff make this the stiffest X-Alp boot Precise 98mm last reduces weight and increases downhill performance Walk mode allows lateral rotations as well as forward Thermo-moldable liner without zipper ensures weather protection Non-zip, mid-size gaiter assures full protection from elements Contagrip rubber sole with tech-compatible inserts