RFID blockers

Just started looking into this while I’m away on work trip and thinking of getting new credit card.

Does these rfid wallets, jammers actually do anything lol?

I know most are probably just oh yeah it’s has this feature when it doesn’t actually do anything.

My question is.. are any of these real? Like ridge wallets for the price I would assume that it would actually protect??

What are your thoughts on this! Don’t want to waste my money but …

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