SleepytimePjs Women's Christmas Pajama Sets with Flannel Pants and Thermal Tops Flannel Enjoy the winter weather in a pair of Fun and Classic Flannel pajamas!! The pajamas are made of 100% Flannel Cotton for the pants and 100% Jersey Cotton for the Top. Pants include 2 side pockets and an elastic waistband with drawstring. Machine Wash Sizes run as follows: X-Small (2-4), Small (6-8), Medium (8-10), Large (12-14), X-Large (16-18).