Salomon’s new QST boots took cues from its line of trail running shoes with the Endofit tongue: It wraps around both sides of the foot, filling space in the boot, resulting in a natural, comfortable fit. The boot’s rigid polyurethane upper shell increases power, responsiveness and control. The lower shell, however, features a softer polyurethane material that sculpts to your foot shape, improving the fit and comfort. A waterproof gusset, located beneath the tongue, keeps snow and moisture from seeping into your boot, too.