The Ibex ST Pro Crampons cut 30% of the weight of Spark's standard Ibex ST by switching to a 7075 aluminum body, without giving up the climbing wire that pushes the teeth fully into the snow on steep or firm terrain. An overmolded ST Tech axle replaces the older mechanism for smooth, easy installation and rotation at the skin track. What Our Gearhead(R) Experts Are Saying:"I put these on for a sidehill traverse that had iced over overnight and never felt a slip, the teeth bit in the same way every step. Swapping them on and off at the transition took seconds, which matters when everyone else is standing around waiting."