Its a small section inside the shoe that can expand up to 5 millimeters to prevent numbness. Without any extension system, the toes end up on top of each other and tend to get numb.
Whether you ride with an SPD system or standard road bike pedals, the Tri X-Speed IV fits them both. No matter if your feet are thin, medium or wide, Garneau's X-Comfort Zone technology prevents numbness by extending the shoe's edges if needed. A wide foot entry makes it easy to perform those first hop-on-the-bike transitions, and 2 hook-and-loop straps help to attach your feet and start pedaling in no time.
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