I've tried fabric masks from several other companies now in a variety of materials and these specific ones are my favorite so far because of the way they fit between my nose, under my chin and comfortably around my ears. It almost floats. The ears feel a little loose where I might want to tighten them but don't have to and mask stays in place. The large was too big for us both (5"3, 5"11 160 lb). I liked this shape better than the double layer cut mask that is made of blanket though that one felt nice. I ordered more in the right size with a different color for each of us. Love that a nurse has put a lot of thought, experience and practicality into this item.
I have not exercised yet in it but there is less resistance when breathing than a thicker mask so I think it will stay cooler. Have not washed but will be wary not to shrink it unless I read it's preshrunk.