Somewhat disappointed in this mask. I wear a respirator on a daily basis in my work. For a while now I have been using the 3M 7500 series, but decided to try this model because of the quick open/close feature it offered. The elastic neck/head bands are much thinner and cheaper then on the 7500 series masks, and more importantly, the facepiece on this model is a stiffer/harder type of plastic. This particular fact means that the mask does not seal nearly as well as the softer silicone facepiece on the 7500 series masks. With the cost of this mask, and the 7500 series mask being approx. equal, I would strongly encourage that a person purchase the 7500 series instead of this one. If a mask does not seal well against the face, then it's not doing it's job! This is simply an older style, cheaper built mask than the 7500 series, and if you're serious about protecting yourself, this IS NOT the mask you want.