They probably would not fall off i would say but the wire would most definitely shorten out after a couple of jumps and moving around because the wire might be tugged and pulled on.
They may shorten out after a while of use because the wire is flat its not that great at maintaining it self i don't recommend them unless u have great responsibly and don't tug or pull your wire.
I snowboard and want a convinient head phone that isnt to big and bulky yet still has nice sound quality. Thought I wanna make sure it doesnt slip off to easily.
Well they do have great grip although i would not recommend them for snow boarding for the simple reason when your moving around alot the wire might be tuged and pulled thus shortening out one ear phone causing great stress i recommend the hesh for snow boarding or the snowboarding mask with built in ear phones which can be found on zumiez hope this helps.