Mine stays dry year after year, as it never leaves its misl. dive gear bag.
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You do realize, that if you learn how to use a straight j shaped snorkel, like a freediver would use ( with no purges or valves of any kind), that it is easy to breath in virtually any size waves you could ever find scuba divers in...certainly 6 to 8 would be no issue...and 2 to 3 foot chop is equally simple.
Rather than wasting money on techno-crap, just find an instructor who really knows freediving technique, and have him/her teach you how to use a snorkel. This includes how to orient it
Regards,
Dan