The one potential downside to this mask is the size; it runs on the small side and is a relatively thick pull. My head is about 23.2" around my temples, and I had to extend the rear slit before I could get it over my head.
Even with the adjustments it fits pretty snug across my face, and it's not the most comfortable mask to wear for long periods of time.
Don't get me wrong, I still love it (my phone camera does
not do the paint job justice
), and I don't regret my purchase for a second. Just wanted to give a heads-up, since the vendor unfortunately doesn't list the size.