This pattern uses a bulky core-spun yarn, but other bulky yarns can be used. The pattern provides info to allow you to customize the fit if you use other yarns or needles. There is only one short seam; the bottom of the hat is worked sideways, flat. The top of the hat is picked up and worked in the round.

Because the hat is worked flat and then in the round, you will need at least double-pointed needles; straight needles or circulars can be used for the band. I used a 16” circular plus double points for the very top of the hat.

There are photos and a diagram to help with the construction.