I do not know so well. Since the first day that you receive the hat I wear when the cold returns. You comfortable to wear, it keeps you warm (for people with sparse hair or baldness suited), it does not scratch and the seams are very well made (for neurodermatitis suitable), it is not too tight (one size), it has one for me appropriate color, no problems with washing (to color, etc.), the ears will keep you warm. It may also be that the cap found me, who knows ...