Tested by Heeluxe: The footwear industry gold standard Heeluxe uses patented technology to analyze comfort and performance against competitive styles in conditions that duplicate real-world wear. Backed by Heeluxe the women's Walk Max delivers superior arch support and exceptional stability built to last all day. Super Critical Foam: Vionic's lightest midsole yet this nitrogen infused midsole offers the highest rebound to enhance your walking motion. Vio Flex insole: featuring a flexible lightweight compound offering optimal moisture control including a perforated heel for added breathability. Upper: Breathable mesh fabric. Footbed: Removable mesh covered EVA Heel Height: 1.75. Platform Height: 1.25. Outsole: Durable synthetic rubber.