Superfeet insoles bluea real people pleasersuperfeet blue were designed to improve the overall fit and performance of a wide range of footwear the biomechanical shape and design have made the blue one of our most popular insoles year after yearsuperfeet blue insoles are vegan and free of latex nickel sulfate formaldehyde and preservativesall purpose performancelong lasting support packed into a thinner high performance insole to help improve the fit of a wide range of footwearfit profil