The X Over is built on the same tried & tested 3D Advanced chassis that is found in Salomons original trail running shoes. This chassis is the backbone & foundation of the X Over providing cushioning, stability & an energy efficient transition from heel strike to toe push off. Beneath the chassis is Salomons tried & trusted Contagrip sole unit with a multi-directional chevron tread which incorporates a dedicated climbing zone under the big toe. The uppers are made from a tough & breathable Nubuk leather with a lightweight minimal PU rand to help protect from scrapes & scuffs. To keep you firmly & comfortably secured in the X Over Salomon have used their brilliant Quick Lace system, which as the name implies, does the laces up quickly, & holds you firmly in place without adding pressure to the top of your foot. Nubuk leather upper PU Rand Rubber toe bumper Quick Lace ssytem Contagrip sole with climbing zone 3D Advanced Chassis EVA cushioning Orhtolite footbed