If it's your edges it's from jibbing they heat up and when they hit the snow they crack from the excessive hot to cold. If it's the sidewall it's probably impacts from landing on jibs.
Its the edges, Sidewalls are fine, nice and strong, ran into a light pole lastnight and didnt hurt it at all. But yea 3 cracks in the edges, I know it take a bit a work to fix that and I know how but just dont really have the money. Maybe I dont know a quick fix? Ive been riding for a while just was curious about this problem I suppose.