The cowl is worked in unturned rounds and you could use any chunky yarn to achieve the same effect.

I hope you have fun with these supersize bobbles, the stitch is very simple and is worked up over to rows using treble (uk) increases and decreases. You can increase/decrease the size by adjusting your starting chains in multiples of four.

There is a visual guide in the blog post to help you. I hope you enjoy these supersize bobbles