This mask snugly to your face on, provided you put them on correctly and provides the nose clip correctly. Round can achieve a "tight connection". Just when wearing glasses it is a problem with many masks. Since the exhale flows the warm breath of the leaks around the nose against the lenses and then .. fogged glasses, very disturbing. In addition, one also has a permanent light breeze to the eyes. In this mask, I am absolutely satisfied plus an FFP3 mask that is denser.
