100% oclv carbon sole is extremely lightweight & stiff for efficient power transfer Dual, independent boa ip 1 dials for precise, zone-specific fit adjustments Lightweight & luxurious tpu upper material for supportive comfort & perfect perforation pattern for breathability Stiffness index 14 of 14;asymmetrical design & superior lace routing system reduces top-of-foot pressure while providing a more secure fit External heel cups & no-slip heel lining prevent slippage & chafing while reacting to your movements more quickly The ergonomic inform footbed is engineered for all-day comfort & support