Buena calidadBought these for work since I work in a hospital setting. They are comfortable and not too thick. Would buy again.If you have a hard time breathing while wearing a mask, this is what you need.The first set I got was great and sturdy the second set I got was questionable about being from the same vendor. I wish I could guarantee the first set which were thick sturdy and held its shape.I've bought a lot of masks off Amazon since the pandemic. These aren't too durable. The straps break often, once about every 10 masks and they weren't made to be worn grey side out like the picture shows.I like the gray color for a change , quality seems to be very goodI wear this mask for my daily work ,it is comfortable and breathable. It is well choice than other masks.the strap can stretch ,the size is fit my face very well.Están bonitas y buenas solo que les doy 3 estrellas por que dijeron que venían 100 y solo vino la mitad en una bolsa poco aceptica, pero por lo demás está muy bien son seguras y el color es muy sentador