This is the Sunflower Tam from Norah Gaughn's Knitting Nature.
The design is based on the phyllotaxis plant pattern, like the pine cone.
I doubled some Cascade Lana D'oro and ended up with a hat that will most likely protect me from ANY of the wet elements here in the North West. I have to say that the yarn I needed was a little lighter, as she called for Lopi. I don't like the itchiness of Lopi so I used the Alpaca/Wool blend. But doubling it actually stressed my hands quite a bit to knit. I used a button instead of the loopy thing at the top.
I actually like it and will probaly make another for a gift!