Chamber IIWith a 10 mm cleat setback, stout internal shank, and water resistant reinforced microfiber upper, the Chamber II is the winning formula that's better from top to bottom. The Chamber II combines a secure fit, durable water resistant reinforced microfiber upper and a full Vibram Megagrip rubber outsole with the added benefit of a 10mm cleat setback. More setback allows you to position the pedals further back under the arch of the foot to reduce fatigue