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The Fly's gently curved shaft strikes a balance between clearance for climbing, ease of use when plunged into deep snow, and good self arrest performance. The hot forged handle is straight enough to plunge easily through snow, while the spike on the bottom gives good purchase when walking or making progress on snow slopes.
The aggressive pick gives performance on steeper terrain, with a bottom hand rest that helps reduce the pump and increase stability on steep ground. The Fly can be fitted with a Raptor pick to improve self arrest performance, useful if winter walking and mountaineering routes are the objective.