Mavic Zxellium Road Shoes Energy Full Carbon outsole is extremely lightweight, stiff, thin (5.5mm) and its low stack height (7mm) is closer to the pedal for excellent power transfer Ergo Lite Upper uses an innovative, bonded construction which eliminates stitch seams for exceptional comfort, pressure-free foothold and light weight Energy Frame + is a lateral and medial TPU frame for exceptional foothold, support and optimal energy transfer Ergo Fit 3D pre-shaped, tri-density, composite insole with high-density rear cradle, vibration absorbing heel and metatarsal elastomer inserts Agion treatment reduces bacteria and odors