This is a super stretchy hat pattern. One size should fit most teen and adult sized heads. If you want a rolled brim for an adult, you may require more yarn to work in pattern longer before decreasing. I used approximately 200 yards for the sample and it comfortably fits my (smallish) head and my significant other’s (much larger) head.
This is a nice, soft yarn to work with that self stripes, and the projects hold their shape nicely.