The QST range from Salomon is their take on the three part ski boot. This is where you have a plastic tongue as well as the traditional cuff and foot sections. With some of the stiffness on the boot now provided by the tongue the flex is more progressive, as you bend into the boot it is initially softer but stiffens as you push more. This allows you to get high end performance from a comfortable forgiving boot. This innovative design when paired with their light weight buckles, super cushioned 3D liners and walk mode make this boot a great all round choice.