Yes, ones with grip on the bottom.
You can buy or use your own.
Yes. They're available for $3 at the park, with varying sizes. Or you can bring your own in! As long as they have most of the bottom covered with grips. Check out your toddler and infants socks! They usually have them on the bottom!
You dont have to wear them but it's highly recommended
Yes. 80% of the bottom needs to be covered in rubber non-slip.
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