This is another variation of my standard crochet hat, but made in a thick soft warm yarn, which makes it a good winter hat and also makes it best to finish off by just rolling up the edge. It is very simple to do, and quick because the yarn is thick. I don’t think the one I used (Stylecraft Cosy) is available anymore, but a chunky (bulky) which is warm and ideally a bit fuzzy will do the job.