Orthaheel Bali Strap Sandal Synthetic 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 Bali is a Medium Width - B sandal. Tri-planar Motion Control system for essential support and stability. Flexible and lightweight construction. The adjustable back strap adds a more customized fit. 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.