Vionic Relax - Vionic Orthotic Slippers Black Rose - 9 Synthetic Textile upper Clinically shown to help relieve common causes of plantar fasciitis heel pain and knee pain related to over pronation and flat feet. Has the American Podiatry Association Seal of Acceptance. Recommended by renowned M.D. Dr Andrew Weil. We suggest wearing for just a few hours at a time for the first few days to allow your body to adjust to the level of support - they will feel very different to regular shoes.