Carbon fiber, high-performance insole for better stability, feel and edge control. Thickness: Max Biomechanical Shape Carbon Fiber Stabilizer Cap: The base of the insole supports the rearfoot and provides structure and stability to the foam layer, reinforced with EVOLyte, Superfeet’s proprietary carbon fiber & polymer blend. Beveled Edge: The beveled foam edge improves the fit in tighter fitting footwear. Responsive Temperature Control: Top cover treated with Outlast Adaptive Comfort to absorb, store and release warmth. Foil Forefoot: A light-but-durable insulating foil deflects cold away from the forefoot. Odor-Control Coating: All natural coating that eliminates odor-causing bacteria.