I originally bought a size Regular for my self based on the reviews I read. It turned out to be too small so I bought an XL. It took a while because the company apparently had a fire at their facility. I kind of forgot about the order until it came in. I thought that the issues with the original one I purchased would be resolved with the larger size but, unfortunately, I cannot get this to seal properly on my face. I know that it not going to be an airtight seal (duh) but it should seal well enough so that it actually filters and not let the air in through bottom or top of the mask. I think the problem is because of the single strap. If I adjust the strap to get a snug fit across the bridge of my nose, the bottom part of the mask does not snug up properly under my chin and if I adjust it to fit under my chin properly, the mask rides up too high on my face. I do not have this issue with the disposable masks that have the dual elastic straps. It appears that the company has possibly also realized this and now makes a mask (model M2.5) that addresses this (I think) with a dual strap design. The overall construction and materials used are good and I like the activated charcoal filters (should be individually vacuum sealed as the activated charcoal starts absorbing once exposed to air) but I cannot get either size to work properly. I did not return them as the first mask was already past the return window and after trying to get the second, larger one to fit, I got frustrated and wrote it off as a $70+ lesson learned. I'm betting that the people purchasing the dual strap masks will be quite happy with them. I will stick with the disposable ones for now and if I can find the newer model mask locally, I'll try it on and if it seals well, I will probably purchase.

If you have a polish/roman nose like I do, these either won't fit, or be painful to wear for more than 5 minutes. Also, very fine wood dust will still make it through.

Nice quality. Solid. Like the ability to switch out filter elements. Have not used yet so holding back a star.

Very comfortable fit. Works well.

Awesome product!!!