in general rocker is superior for powder skiing; it provides way more lift for skis with almost equal dimensions.
a rockered or reverse cambered ski is superior in powder
now if you wonder whats the difference between a reverse camber and rocker?
rocker is basically a ski thats regular cambered under the foot and then curls upwards
a reverse cambered ski is basically a banana all along its running length.
regular cambered skis have abviously got an advantage on hardpack, since your edges have a much longer running length and get greater contact with the snow.
however, recently we see park skis being introduced with park dimensions ( skinny planks) that also have rocker.
the advantage is that your ski is more forgiving, playfull, will less likely catch an edge, butter better and will ski like a much shorter ski.
disadvantages; you have less control when charging, carving is more difficult and your skis will wash out on you if you land sketchy stuff...
if you're interested, check out the 4frnt techtalk webisodes, they describe all kinds of camber; regular camber, reverse camber, early rise, rocker, early tiprise, etc....
i would personally suggest regular camber skis for park and all mountain and rockered skis for powder
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