Gerber 2 Piece Thermal Sets is made of 80% cotton/20% polyester for a comfy fit. The fabric offers an extremely soft hand for comfort and feel. PJ's are designed to fit snug for child's safety. Gentle elastic covered waistband on pant provides a great fit and easy to pull up and down for changing diaper or learning to potty train. Easy to care for machine wash and dry. Assortments include all-over prints. Available in sizes 18 months, 24 months, 3T, 4T and 5T.