The Kea is a simple slip-on with essential support, with colorful mesh uppers and twin gore panels on the vamp for ease of movement. All-around comfort is the name of the game. Mesh and man made 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 Medium (B) widths, sizes 6.5-10 Coming in July: Wide (D) widths, sizes 6-10, 11 More medium width sizes 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.