I just got a Hobbs Tuscany Polyester batt to play with. Not sure how it compares to the Hobbs Polydown. It's about 1/4" thick, very even. I meant it for hand quilting but based on my experience with other poly batts this thick, I'd expect it to go through a machine quite nicely. Thick enough to get great definition, thin and firm enough not to make too many boogers and lumps.