This is the latest in diapering miracles - a micro fleece diaper cover from Bummis! The Polar Bummi combines hi-tech performance with super softness and comfort. Two layers of breathable fleece with a highly breathable laminate sandwiched inside - this diaper cover is the ultimate in comfortable diapering wear. Never too hot - use it all year ‘round.  Most breathable diaper cover, allows airflow in to help eliminate diaper rash.  Great for overnight.