Batting is really determined by the end use/desired results of the
quilt being made. If you're looking for light-weight warmth, Warm and
Natural Batting is wonderful.
If you're making
a wall hanging (you don't need warmth and you don't want it to be
heavy), a very light cotton or polyester/cotton blend is good.
The following link has an article and report about various types of batting:
Happy Quilting!
Penny Halgren
www.How-to-Quilt.com
