Vionic with Orthaheel Tech Women's Carla Sandals Synthetic Synthetic sole Platform measures approximately 0.75 Built-in podiatrist-designed and tested orthotic arch support. Restores the foot's natural / neutral alignment which enables the feet- ankles- and legs to function dynamically as they were intended. Orthaheel Carla 2 is a Medium Width - B sandal. Tri-planar Motion Control system for essential support and stability. Flexible and lightweight construction. Update of the previous Orthaheel Carla sandal adds new colors and improved quality. Great for people who have plantar fasciitis or over-pronation. Research supports Orthaheels success in reducing over-pronation- which can help relieve associated conditions such as heel and ankle pain.