Nobody wants to hear it, but there's a limit to the power you can put out in a day. You can't avoid hitting that threshold when you're going all out, but you can move it back by wearing light, aerodynamic gear like the Mavic CXR Ultimate Men's Cycling Shoes. Their sleek construction reduces air resistance, and while that won't increase your watt output, it will make you more efficient so you'll get to the finish with more left in the tank. The CXR Ultimate weighs 70g more than the Huez, Mavic's lightest shoe, but is far more slippery, thanks to the CXR Aero zip-up cover that provides a slick, smooth surface for the air to flow over. Underneath, an Ergo Dial ratcheting strap provides a snug, pinch-free fit and the Ergo 3D tongue creates maximum foot hold while maintaining comfort and breathability. The Energy Lock Carbon Comp heel counter keeps your heel from slipping, too, and the Ergo Fit 3D+ Ortholite footbed provides heel and arch support, not to mention superior power transfer into the sole. A too-soft sole will compromise your power output, while an incredibly stiff one will hurt your feet and make walking nearly impossible. Mavic's Energy Full Carbon SLR outsole is a powerful platform that won't flex too much under serious force, but also doesn't feel like an iron plate. It 's just 5. 5mm thick, so you'll have a great feel for your pedals, and is compatible with all standard 3-hole road cleats. The soles also offer up to 6mm of fore/aft cleat adjustment, so you can fine tune your setup to your preferences.