A technical approach shoe aimed at serious approaches and via ferrata. The BoulderX uses La Sportivas patented mythos lacing system to give a precise, technical fit and a tough vibram sole. 

La Sportiva say:

The ultra sticky Vibram sole with climbing zone make this model the ideal choice for technical approach routes and via ferrate . The new and improved sole design provides even greater grip while climbing and the Impact Brake System offers enhanced braking power for descent routes. The soft 2mm EVA insert guarantees optimum anti shock properties. The full rubber rand offers maximum protection against abrasion while climbing. The patented Asymmetric lacing system derives from the Mythos climbing shoe project.