Gerber Two Piece Infant Thermal Underwear 100% Polyester Gerber two piece thermal PJ sets feature grow cuffs on the sleeves and ankles for extended wear, are designed to fit snugly for safety and have gentle elastic waistbands on the pants for comfort. 80% Cotton/20% Polyester with a touch of spandex in the trim Machine wash and dry Allover print top and pant Great item for gift giving.