I wear a 7 5/8ths baseball hat (New Era fitted). Most trucker style hats look terrible on my huge dome or simply don't fit. I saw reviews on the Patagonia website saying that this was a hat for folks with larger heads and that is absolutely true. I don't know if it would fit smaller headed folk, which it may, but it certainly fits the bill if you have a larger sized head.
I loosen the hat from the "standard" position (all nubs in holes) two nubs for normal wear. If river rafting or heavy wind, sometimes I tighten it by one hole just to be sure.
The hat looks great, takes a beating, and keeps going. My first one is about 5 years old and is faded, but still looks good. Go get one, they are worth it!