Inspired by high-altitude mountaineering, the Index APX is built for riders who define the edge of what's possible. Its full-length Storm Cover wraps the entire boot in water-resistant armor – a radical design concept that protects your feet when conditions turn savage. Dual H5 BOA® dials offer micro-adjustable foot-hold, while pro-level Vibram® grip opens up the steepest and deepest of objectives. Push further.