I have made a "summer "quilt with out batting. Yes the quilt is lighter but it also has no body and wrinkles easily. Advantage to no batting is that you do not need to do much quilting since there is no batting to hold together. Also I made a "summer" quilt with flannel as the batting thinking it would be lighter and cooler- NO. Actually it was just as heavy and warm as one made with my usual batting- Hobbs 80/20 and cost much more since flannel by the yard for a large quilt is more expensive than using batting. Bottom line- I will always use my regular atting since it is really not too heavy or warm.