From Vionic, the Slim Fit Insoles feature: Received APMA Seal of Acceptance SLIM FIT is our inside secret Podiatrist-designed as a cost-effective alternative to custom-made orthotics Designed for everyday use: fits all types of women's casual, flats, and up to 1” heeled shoes Fresh antimicrobial and Odorban™ anti-odor top cloth Supports the metatarsal bones, and helps provide relief for effective relief from foot pain including metatarsalgia and Morton's Neuroma Shock-absorbing polyurethane materials provide comfort and flexibility For best results, it is recommended that you replace your orthotics every 6-8 months Imported.