Vionic kallie slip on black sandals size 6 * Upper: Knit Fabric. * Footbed: Removable Textile Covered EVA * Outsole: Durable Rubber. * Heel Height: 1.75". * Platform Height: .75". * 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.