I'm not sure how effective any of these masks really are and I've had a few different ones but , at least, this one fits well, is comfortable to wear, and does not ride up on your face when you talk. The cover is long enough to fit snugly under the chin which helps it stay in place.They sent me a coupon for another free set but when you reply, it's a quid pro quo arrangement where you must give them a review to collect the "free" set. They encourage a 5-star rating and fortunately, I think they really are superior to other masks at this price point that I've had but I don't like the con job used to get a good review.
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