Good surf hat
This hat fits well and keeps the sun off your head. It stays on when duck diving but you need to tighten it up a bit when the surf is a bit bigger and could pull it off. There are two adjustment points to customise it to your head size. It has a string to put around your neck in case it does come off so you don't lose it. It doesn't block your peripheral vision so I reckon this is a great surf hat.