Need proof of evolution? Try the Petzl SumTec Mountaineering Axe. This progressive piolet takes features from both the technical ice tool and the classic-shaped axe to give you insane versatility and low weight in the mountains. The slightly bent aluminum shaft features Petzls TRIGREST that adjusts on the fly without toolsbring it down for steep ice sections and slide it up when you slogging up the summit ridge. The curved forged steel pick is fully interchangeable for different climbing applications, and wide holes in the head and spike let you easily clip in.