Headphones for toddler ear protection?

Starting to do some research on something to buy for my five year old. Figured some people here might have some experience for a sporting event/concert. Any suggestions would be appreciated, thanks!
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There's a bunch of options, but you don't have to go crazy, we spent 20 or 25 bucks, don't recall the exact model, but just basic noise cancelling headphones worked fine for him.
They fit, they work and she likes wearing them. Reasonable cost for preserving something as priceless as hearing.
Good for you for looking out for your kids.