The Vibram Sierra is a composition flat sole for use on casual and outdoor footwear. The Sierra has the same functional design as the performance-proven Foura and Olympia soles. Unique design and placement of lugs, mixed with the exclusive Vibram compound guarantee maximum traction on a variety of terrains, including wet and cold surfaces. Multi-directional lugs provide user with substantial edging capabilities for braking, push off, and stability. OF