Last time we were there (which granted was 4 years ago), they were. My son wore his anywhere which surprised me because around here they absolutely don't allow them in most places, and certainly not on water slides. However, I did notice that compared to our previous visit (2 years earlier) that they really were encouraging you to get a life jacket (available I believe only with a driver's license) for the kids instead. That might be an option - get him used to using one of those instead - they're much safer and I believe most places allow them. The kind they had were the kind you'd use for say waterskiing (a vest type) - not the orange bulky around the neck ones.