Every Yooper Chook has some stretch to the fabric. Some fleece is stretchier than others, but they all have some give. Also, the fleece is not wind proof. One could not breathe through the facewarmer if they were. But they definitely make a huge difference in the wind regardless.
Double Domes have less stretch. Be sure to measure your noggin to help the cause. Since each Yooper Chook is hand cut and handmade, that means they are not precise measurements for each individual chook.