It Weighs Nothing
Well almost nothing.
First, lets be clear, this is a axe you carry when you may need an axe for a little while and the snow is going to be soft enough. If you encounter ice, you're done. If you need it to plunge time after time, hour after after, you're done.
It's too light, dull, flimsy, etc to use as a serious tool for a serious mountain route.
It weighs nothing!