big mountain must be off piste. I think of it as either very steep and/or gnarly terrain or very fast open terrain. cliffs etc are by no means necessary to justify the term big mtn.
all mtn is the same but includes piste.
in this light, an all mtn twin is the karma or chronic wide, but the ANT pro, Prophet 130 are big mountain twins. then theres big mountain freestyle like sumo, sir francis bacon.
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