The Chamber II combines a secure fit, a durable, water-repellent, reinforced microfiber upper, and a Vibram Megagrip rubber outsole with the added benefit of a 10 mm cleat setback. Thanks to the larger setback, you can position the pedals further back under the arch of your foot to reduce fatigue and improve positioning in technical terrain. The inner shaft has also been updated with a tri-mold construction that optimizes stiffness and flex for each zone of the foot. The result is an overall performance level that is improved from top to bottom, with the right amount of flex for pushing uphill, incredible pedal efficiency, and a better connection to the pedals.