The Lake MX237 Shoes may be built to maximize efficiency, but a host of thoughtful features make them far more comfortable than their race-bred heritage might lead you to believe. Sure, Lake's extensive experience helps it to channel every last watt to your pedals, but the dual Boa closure gives you tons of fine tuning, and the full grain leather upper breaks in like your favorite leather slippers. Granted, you probably won't want to wear them around the house, but when you're dropping the hammer, they're a much better option. The key to the MX237s' power transfer lies in Lake's Competition last. Like the moldable CFC last used in the MX331, the Competition last is designed to focus your power output into the ball of your foot, and straight through to the pedal. And while efficiency is key, there's added room in the toe box to allow for foot expansion under hard efforts. And it all rests on Lake's stiff Race carbon fiber sole. The result is a comfortable fit, packaged in a highly efficient shoe. The dual Boa closure has been quickly adopted by the professional ranks due to the fact that it offers easy fine-tuning, and it stays tight throughout your entire ride. And since you're able to independently adjust tension on the forefoot and the heel, you can lock down your heel, without having to over-tighten the rest of the shoe. And as you probably know, that means better bloodflow and greater comfort. The Boa closure runs underneath the full grain leather upper, enhanced with mesh panels to maximize foot-cooling airflow.