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. Technical Information&';s: a Material: UHMWPE and HTPE 40mm center strap, Chromoly steela Heel Lever with micro adjustmenta Fixed pivoting point cable attachmenta 3 sets of holes for a wide range of bail adjustmenta Chromoly steel front and rear railsa Sold with automatic compact toe bail and semi-auto toe basketa TPU Active ABS to prevent snow baillinga Weight: 571 g without ABS and 623 g with ABS a Sold with storage bag that attaches to waist belt on backpack for quick deployementa Certifications: CE EN 893, UIAA 153a Ideal for mountaineeringa Shoe sizes: 35EU - 47EU