Will an all-mountain powder snowboard do well in hard pack snow?
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There are all Electric Mountain Board that will perform well on hard pack and powder, and there are powder boards that will absolutley not perform on anything but powder, including hard pack.
Generally, skis or boards designed for powder, i.e. heavily rockered, split tail, reverse camber, etc. are highly specialized, amazing on powder days, but dismal on anything but soft snow.