Articles of manufacture and articles of wear may include one or more
retractable traction elements. A plurality of the retractable traction
elements may be interconnected by a base member and may form an insert.
Each of the retractable traction elements may include an extension
inducing element and a ground (or other surface) contacting element. The
extension inducing element may flex in response to an applied force and
may cause the ground or other surface contacting element to extend and
engage an underlying surface.