The Vionic Flex Sierra has a knit and man made uppers. It is firm yet flexible, removable textile-covered EVA orthotic insert. It has a durable rubber outsole. Vionic's active footwear features Advanced Motion System (AMS) technology, combining our podiatrist-designed orthotic with a flexible, cushioned outsole and a lightweight, breathable upper. Step into support for work, play and everyday. Recommended by Dr. Andrew Weil.
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