Sidi's Vent Carbon soles optimize your power transfer and ensure top comfort, too. They deflect just 1.4mm when 110 pounds is suspended from the tip. Plus, a small degree of toe flex is built in so you enjoy comfort mile after mile.
Another great feature is the built-in adjustable vents at the front of the soles that can be set to let in or seal out the air. When open, the vents work with the channels beneath the perforated footbeds for excellent airflow and comfort.