Fyn's sturdy EVA midsole adds stability to this sleek active sneaker. With an improved rubber tread for added traction, contrasting ombre laces and breathable mesh upper with a hint of stretch, Fyn is a true winner. Stretch textile upper. Firm yet flexible, removable textile-covered EVA orthotic insert. Durable rubber outsole. Vionic 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. Available in women's whole and half sizes 5, 6-10, 11 Fits medium (B) widths. For the greatest comfort, we recommend wearing your new Vionic footwear for just a few hours for the first few days to allow your feet to adjust to the new level of orthotic comfort and support. Within one to two weeks you should find the product completely comfortable and supportive.