Crampons are metal skeletons or frames with sharp points that are attached to sturdy mountain boots. They allow a climber to ascend ice gullies, waterfalls, and snow and ice slopes without slipping since the sharp points bite into the ice. Most crampons have 12 points, with two pointed straight-out on the toe for frontpointing. They are attached to boots with straps or with a step-in attachment system. There are two basic kinds of crampons--hinged and rigid.