- Leverlock - works with almost all modern mountaineering boots.
- Flexlock - if your boot doesn't have a heel or toe welt, go for the Flexlock.
Learn even more about fitting crampons here.
Weight (Leverlock): 1lb 13.7oz / 842g (with FIL), 1lb 14.7oz / 872g / (with FIL FLEX)
Weight (Flexlock): 1lb 15.4oz / 892g