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A more rigid twelve point crampon is better for winter climbing.
These grades are there to indicate the companion boot with which the crampon works well.
A C3 crampon is a necessity for ice climbing or other extreme forms of mountaineering.
Gingerly, he played out more rope and descended lower, the slope now near-vertical so the toe of his crampon bit into the rock-hard ice.
A C1 crampon with straps all round can be used on stiffer boots.