We’d all love to have a bit more protection in certain situations. During flu season, when working on sanding projects around the house, and painting. You can have the protection you want with the O2 Curve Breathable Face Mask. This face mask protects against particulate matter down to 0.1 microns. And it’s comfortable while doing it. It features a medical-grade silicone seal that provides great protection—since the way the mask seals to your face is one of the most important aspects..