IIRC my Bro-in-law said they are required for saltwater salmon fishing in California. Maybe post this same question at Catcherman.com. I think they are a California based site.
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- the sun and the sand and a drink in my hand,with no bottom...no shoes,no shirts,no problems.

- no boss, no clock, no stress, no dress code...no shoes,no shirts, no problems. - Kenny Chesney -