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.