From OOFOS, the OOmega Recovery Thong Platform Sandals feature: Proprietary OOfoam™ upper American Podiatric Medical Association (APMA) Approved. Awarded the APMA Seal of Acceptance for promoting good foot health and being of exceptional quality Signature brand detailing on the side Slip on style OOfoam™ technology for impact absorption Impact absorbing OOfoam™ footbed MEGA midsole for added comfort Proprietary OOfoam™ outsole Weight: 7 oz. The weight of footwear is based on a single item, not a pair Imported. Styling Notes: Product measurements were taken using size 9, width M. Please note that measurements may vary by size.