Brainwaves

This hat pattern is the easiest of all of my recent patterns. There are no fancy techniques in it. It all knits in-the-round, from top down. The only thing you're supposed to be familiar with is decreases&increases and basic short rows.
There are three width sizes in the pattern; all aimed to fit an average adult's head. There’s no need to pick a size in advance; you can decide on that as you knit to a certain point (and by that point you will alreay know what your gauge is). The length is totally adjustable.
Why I gave it this title? Because it resembles me the slowest brainwaves - delta waves, which our brain produces in a deep, dreamless sleep. I can't promise that you will be able to knit this hat while you sleep, but your brain won't get overheated with this pattern.
Materials:
- 50g (200m) of fingering-weight yarn:40g (160m) of selfstriping yarn; 15g (60m) of contrasting color;
- 2.5mm circular needles with metal tips;
- tapestry needle to weave in ends;
- pompom. Make one or buy one from a craft store.
Gauge: 25 sts by 30 rows in 10 cm (plain stockinette).