I use Cascade 220 for all my clogs. They turned out really comfy. I believe Michaels now sells a lot of feltable yarn that you could get with 40% off coupons, but I have never used any of it. I prefer the Cascade over other feltable wools b/c it isn't too hairy. Some yarns shed so much I feel like I am pulling a cat out of the washer.
How thick something felts is a matter of how thick the yarn is to begin with and how much you let it felt. The more you let it felt the thicker and smaller it will get.
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