100% Flame Retardant Fibers. No Chemicals Added Designed not to melt or flow when in contact with flame and to form a barrier - passed the Cal 604 test. Needlepunched into Beautiful, Soft, Cozy Batting Breathable with a naturally soft look and feel. Confidently stitch up to 6" apart No prewashing necessary. Only 1% shrinkage in a cold wash, air dried. 3 % shrinkage in a warm wash, warm dry. Finished quilts may be machine washed and dried. Remember, your prewashing and selection of fabrics and thread will also effect shrinkage.