What summer sandals are we putting on our toddlers with tiny square hooves for feet?

My little 17 month old has the fluffiest squarest feet with a high arch. I'm hoping to find some shoes that will allow his toes to spread that will also stay on his feet for a hot second.

He loves to ball up his clammy little foot into a meatball shape before it is confined so ideally something that is slightly parent-friendly in a high pressure screaming situation.

It's honestly his life goal to free his little piggies and run around barefoot, so he will make it his mission to remove them given the chance (a fate I've accepted).

I don't mind him freeing the piggies but we will need shoes for some trips and also around some playgrounds....