The Grivel Rambo Evolution 4 Crampons use a monopoint design to allow precise footwork on mixed ground and a shorter secondary point to increase stability on pure ice. Combine this point configuration with a rigid frame design, and the Evolution 4 Crampons show their true colors as serious tools for technically demanding ice and mixed climbing. Add the removable heel spur (not included) to give these Grivel crampons an advantage on ultra-steep mixed terrain. This latest evolution of the always-popular Rambo crampons also includes an integrated active anti-balling system to keep snow from building and destroying your traction.