Boston Celtics Women's Headway Flannel Pajama Pants. Show your Celtics spirit as you lounge around in these lightweight plaid pajama pants. These pajama bottoms have a team-color plaid print with the Boston team logo embroidered on the left leg. They are made of a 55% Cotton/45% Rayon flannel for extra soft comfort and a 100% Polyester satin drawstring for a perfect fit. Now you can show your team pride even when you're sleeping! Go Celtics!! Officially licensed Boston Celtics fan gear.