This crampon has a chromoly steel front and rear rail. Both rails are equipped with an antibott system. The front rail is asymmetrical to give you maximum performance and balance. True to the Harfang line, the Alpine uses our central main textile strap that connects the front and back rails. The main strap flexible linking system minimizes bulk and offers an incredibly compact option. The Harfang Alpine is designed to fit any boot with a heel welt and includes two front bail systems: a compact full auto and semi-auto which are easily interchangeable.