Anything that is slip-on can always come off easily on a roller coaster. When I went to Unversial I worn a pair of crocs flip-flops. I took them of and put them under my but on the rides, as many other people I saw did too.
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Disney World doesn't have any specific rules about what shoes can be worn and where — except for one! The rubberized clog-style shoe made famous by the Crocs brand is prohibited on escalators around Disney World. No Crocs on the Disney Springs parking garage escalators, please!
Although crocs don't have enough heel security for your feet to be secure in the shoes. This slip-on of the crocs is so good. And yes you can wear them at the airport as they are so comfortable and relaxing. Also, they have slip-resistant properties that make them convenient to wear on any slippery surface.