Warm & Natural is the preferred batting among quilters world-wide. Beginner friendly and requested by name, don't get caught without it. This batting will not separate, bunch or beard. This 100% USA grown cotton is punched with hundreds of needles through a thin base material (polymer fibers) to prevent tearing, shifting, migrating or creeping through the cover fabric making it 87.5% cotton/12.5% polymer fibers. Needled cotton's flexibility makes it ideal for both inside and outside use. Fibers are held together without glue so a quilting needle glides easily through the batting. What an incredible difference! No need to pre-wash, machine washable after quilted, can be used as an exterior fabric, quilt up to 10in apart, easily dyes and your fabric will cling to the batting while quilting.