If you want a fluffy fullness then you need a higher polyester content. Cotton is flat and the more cotton in a batting, the flatter it is. Polyester comes in a variety of lofts. High loft will give you that cloud-like appearance and feel. Low loft will be much thinner but fluffier than cotton. I think you need to experiment and see what you like best. I am a Warm and Natural cotton girl but I am moving toward the blends.