Warm and Natural Cotton Batting: Crib Size 45" x 60" Batting will not separate, bunch or beard. These 87.5% cotton/12.5% polymer fibers punched with hundreds of needles through a thin base material to prevent tearing, shifting, migrating or creeping through the cover fabric. 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 10" apart, easily dyes and your fabric will cling to the batting while quilting.