When I have purchased muslin, if I am using it in a quilt top, I get premium muslin. If I am using it make a pattern mock-up for say, a dress, I just get the utility muslin. The premium muslin costs more, of course, but it is smooth to the touch, doesn't have much as far as nubby things in it. The utility muslin is woven much looser, and it just looks more coarse. Hope this helps some!