Won't fit if you have smaller head. I wear between a 7.5 and a 7 3/8 hat and if my head was any smaller this would be super loose and falling off nose. I think it fits me perfectly but just want to ensure those with smaller heads/faces know what the are gettingLOVE these neck gaiters! I have several without the added filter pocket. I wear this one and wash it almost daily- because it has a bit more protection. I work front-lines non-medical. I have to wear a mask almost all day during the work day. This makes me feel far more protected without rubbing my face raw and feeling like I'm gonna be a mouth-breather for the rest of my life. Wish the sold packs of them!!This is a great mask and fits as I expected.Nice material, it's a nice fit over all but it doesn't like to stay on my ears and it's thicker than I like, but most people may see that as a bonus.The one-size choice is a little too big but I have made adjustments to it. The fabric is thicker than most for better protection.I really like this!! It came with the filters !! I was hesitate due to all the reviews. It’s not as thick as some others , come on people what do you expect, make your own if you want quality that your looking for . I will be ordering more for my husband. These are big for a smaller face as it continues to fall down.well made, comfortable to wear, very stylish, light weight, easy to put on and stays in place dose not cause excessive perspiration on the nose and mouth. I highly recommend this face mask.You are never looking for a mask, since you can wear this as a scarf when not needed as a mask. It is convenient because you always have it on.