The Coach Carmen™ Race Walk Shoe has a four-part zero-drop midsole. (Colors do not match the final shoe.) Each piece is angled in nature. The gray part above the blue section is a heel wedge for comfort at impact. The blue heel section piece is the most firm and is designed to provide lateral stability at impact. The gray center piece is a pivot part which is softer than the heel section. The white toe section is resilient, encouraging a spring in your step. The angles of the gradient parts are steeper than those in the casual/training model. The result is a quicker rollover for walkers on the move. Finally, the outsole is a newly released Vibram® LiteBase 100% rubber product that is both lightweight and durable. The lugs offer traction for the trail, track and road.