Lake's top-tier road shoe gets an update in the new CX403. Featuring the same custom fit carbon fiber sole and supple kangaroo leather upper as its predecessor, the CX403's BOA closure system is redesigned and the added rubber toe bumper helps extend the shoe's longevity. These CX403 Shoes are offered in a Speedplay-specific sole, eliminating the need for adapter base plates and lowering the stack height for improved power transfer. Lake's Custom Fit carbon soles are heat-moldable, ensuring the perfect fit and incredible heel hold. Compared to the CX402, the CX403's instep strap is twice as wide to better disperse pressure from the upper BOA dial. By employing two Boa dials, Lake enables you to keep your heel locked down, without requiring undue pressure on the forefoot. And as you already know, that means better blood flow, and greater comfort.