Unfortunately I found that the hat I bought was not actually waterproof, which rather defeated the object of buying it in the first place.
While on holiday I wore it on the one rainy day we had and it became totally sodden and my head was soaking wet. It took two days for the hat to then fully dry out when left to drip dry in the bathroom during which time it was unusable.
I also noticed that when the hat was being worn the inner and outer layers tended to drift apart and so I had to keep pulling it down for it to fit properly.
The cheaper beanie I had that this was meant to replace actually does a better job of keeping your head dry and so I'll be sticking with that.