I've tried many disposable and re-washable masks these past 8 months. By far, these are the best. Why? They fit my face snugly so my glasses do not fog up in cold weather. The longer nose bar allows a tighter fit on the top edge, so when I exhale, the air exits on the side and bottom edges, not from the top edge. So, no fogging my glasses when I'm outdoors in the cold. I will be buying more of these to last thru the long winter here in Western Canada.