Grivel Air Tech Crampons New Classic Type Belt type, so it can be attached to any shoe. I've used them quite a bit for snow mountain climbing. There is also rust. Please check the photos carefully, and feel free to ask any questions. These items have been used for mountaineering. Please understand and accept this before purchasing. Returns and exchanges are not accepted. The New Classic system allows use with mountaineering boots that do not have a heel welt. The joint between the front and rear pieces is a flex metal plate, so it can be used with shoes that have a relatively large sole flex. It can be used with many mountaineering boots. The claws of different lengths with "barbs" stabilize the feet even on unstable terrain. This is how to thread the belt when attaching New-Matic or New Classic system crampons to small shoes. By threading the belt to the tip of the harness, you can pull the front two claws to the sole of the shoe. Air Tech crampons have all the claws designed to be shorter compared to the G12. The shape and direction of each claw are also designed to provide stable walking not only on snowy and icy slopes but also on rocky ridges where rocks are exposed due to wind-blown snow. The front piece is shorter than the G12, so the claws are closer to the toes, and many claws grip firmly even in narrow stances. The semi-circular cutouts on the claws act as "barbs" to increase grip on ice and rocks.