The result of years of research and field testing, the Superfeet Carbon Insole is for the dedicated athlete who demands high performance results. Superfeet’s revolutionary insole achieves a new level of lightweight performance by combining a carbon fiber-reinforced stabilizer cap with a durable, ultralight foam layer. Carbon’s distinct biomechanical shape and low-volume design can help improve the fit and feel of tight-fitting athletic footwear like cleats and lightweight shoes. Add/Apt System - Encompasses the biomechanical science, technology, function and craftsmanship that adjust your footwear’s flat, 2-dimensional midsole to your 3-dimensional foot Fit Profile. Low-profile insole with a versatile shape offers high performance support Fits Best In. A wide range of tight-fitting, low-volume athletic footwear with removable insoles Size F.