Sidi's 3-Bolt Vent Carbon Soles maximize your power transfer, ergonomics and comfort and weigh 38 grams less (each) than Sidi's popular Carbon Lite Soles to keep your shoes nice and light. Made of tough T700 carbon, these sleek soles actually deflect only 1.4mm when 110 pounds is suspended from the tip, which means exceptionally efficient pedaling. Plus they flex just enough to prevent pressure points. And they're called "Vent" because they feature closeable toe vents that let you control the airflow for top comfort. They're also hand made in the same Italian factory as Ferrari and Ducati parts!