All of them. We aren't going to reserve the term for type 1 jackets that very few wear. Of all the situations where it is in one's best interest to wear a life jacket, few of them require 30 pounds of flotation and head support.
And I state again, it has not been shown that head support actually saves lives. In rough water, that head support is not going to keep a dopey swimmer's mouth out of the water, and rough water is precisely where one needs a class 1 to do the job.
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