UPPER: Tough synthetic leathers provide great protection, excellent durability. Anti slip heel lining. Low profile micro adjust buckles. Cross X Strap is optimized for relieving tension on top of foot during push off motion. Custom Fit heat moldable insole with adjustable arch wedge provides support while optimizing heel stabilization. LAST: Shimano Dynalast XC secures the foot into the ideal ergonomic position for a more efficient upstrokeSOLE: XC race specific outsole is lightweight, stiff and combined with an lower stack height providing superior energy transfer and efficiency.