Don't be so sure of that, a lot of the better electronic circuits can be set to not transmit certain sounds into your ear-this is a trade off as it will make some others sounds not seem true to life.
I have had this done with both my in ear plugs and my muffs as Wellington is very windy.
As to rain-never had a problem in light rain and have always taken them out in big down pores as it's a lot of $$ to risk. Have been recommended to use a brimmed hat to protect them but hats and I don't mix so never have.
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