Using 4.5mm needles, I used some Jo Sharp Desert Garden Aran Cotton yarn I purchased years ago from the lovely ladies at Knitting Inspirations. The headband took just over one ball and I found the yarn lovely to work with and entertained thoughts of maybe even a summer top from it someday?
It was a very quick knit - I followed the guidelines of the pattern but made the length a little custom by adjusting the number of rows knit before increasing. I'm finding the headband SO super comfy, and it doubles as an excellent eye-mask to keep the light out when I'm trying to sleep in on our one day off!
p.s. I have a bit of a back log of projects to post about - such as this one. I'll catch up soon hopefully!!