The trick is that there are two hats in one. The first hat is knitted from a square crown down and then a second hat, which sits inside the first, is knitted from the brim up. This hat is a loose fit and very warm.

The hat in the photograph is knitted using Coop Knit Socks Yeah! But this hat could be knitted in any yarn to fit any head size. On the last page of the pattern, there is an interactive form which helps you to customize the pattern to your head size and yarns.