The fit is so comfortable, you’ll probably forget we built it with fire retardant leather and self-extinguishing split suede. But we did, along with everything else the pros demanded. That includes the fire shielding of patented CarbonX, a synthetic that outperforms all NFPA 2112 standards for flame resistant garments. For tactile response, the 3-D anatomical construction includes a high-grip outsole that gives you a responsive feel of the pedal. CarbonX Technology All Oakley Motorsport products featured our patented CarbonX technology, which meets or exceeds fire protection safety standards. SFI / FIA Safety All of our Oakley Motorsport boots are SFI 3.3/5 and Formula One FIA approved Professional Grade racing footwear. Form and Function Self-extinguishing split suede with supple comfort that shapes itself to anatomical contours. Grip and Pedal Feel Oakley race boots feature a high grip vulcanized outsole allowing you maximum sensitivity and protection. Oakley - Race Mid Shoes Sizing Chart