I made this hat held together 2 strands of sport weight yarn. You can use worsted/ bulky weight yarns match with the gauge instead of 2 strands of sport weight yarn. And also I have included the instructions for how to make a beanie using this pattern in the note section.
Click on the link to go to the pattern. http://crochetforyoublog.com/2015/07/crochet-zigzag-popco...