Engineered for total control and lasting comfort Ergo 6S features dual NUUN(TM) 001C aluminum dials Firmor lateral support and an UNUM ergonomic upper for adaptive fit. Weighing just 278g it's crafted from 1.2mm engineered microfiber and built to endure. The full carbon sole (stiffness index 11) includes a 12 mm adjustment range for personalized positioning and maximum power.Premium 1.2 mm soft and light Microfiber upper with localized holes for maximum ventilationDual NUUN(TM) 001C aluminum dials connected to firmor allow for fast precise and aerodynamic fit adjustmentsFirmor Lateral support system and Unum Ergo anatomical tongue provide a perfect fitR2FC Carbon sole with Nexus Bridge has a stiffness index 11 ensuring all power is transferred to the pedalsIndependent cleat positioning for custom alignmentCrafted to last with replaceable Parts: heel stud dial removable insole