Details: Top Cover Material: Polyurethane LeatherPerformance Base: Thermoplastic urethane for shap retentionInsole Thickness: .0125""Recommended for: ProfessionalsBest for: Dress shoes and shoes with no removable foot bedHow to Use: Begin by removing the footbed in your shoes, if possible. Replace the insole with your Aetrex Fashion Orthotics. When placing your new Cobra shaped orthotics in your shoes, make sure the arch is placed on the inside of the shoe.