Superfeet Carbon | Thin and Strong Insoles for Pain Relief in Performance Athletic | Unisex | Color GraySuperfeet Carbon Thin and Strong Insoles for Pain Relief in Performance Athletic Unisex Color Gray The result of years of research and field testing, SUPERFEET CARBON is ideal for the dedicated athlete who demands high performance results. This revolutionary insole achieves a new level of lightweight performance by combining a carbon fiber reinforced stabilizer cap with a durable, ultralight foam layer. CARBONs distinct orthotic shape and low volume