So what is an X3 100 CS boot anyway? Well if you’re up on the lingo, then you would know that basically means this boot is too legit to quit. Salomon’s X3 boot is a thing of beauty. The CS portion of the name refers to Custom Shell feature that Salomon put on this boot; this feature essentially lets you customize the width of the shell (Awesome!). Additionally, Salomon gave the X3 100 a My Custom Fit Pro liner for even more customization. The bi material Polyurethane shell and cuff are very strong, durable, and transfer energy efficiently for a superior response and feel. Salomon also made the X3 100 CS boot shell with World Cup Advanced Shell technology, in case you wanted to know what kind of tech was thrown at this boot. Strap it all down with 4 3D micro titanium buckles and you got the Salomon X3 100 CS boot. Stiff and customizable, this boot is ready to race.