Realizing all face and head shapes and sizes differ, for me, and I would assume most, this mask cups perfectly over the nose and under the chin. The obvious issue, considered up front due to the plastic window, is the build of condensation, moisture. An anti-fog spray, or drops should alleviate this issue.

It works well after you use a defogger technique of your choice. I'm pleased so far.

These masks allow me to communicate better under the constraint of wearing them. I have noticed people are visibly friendlier when they can actually see your face and smile. They do need so.e sort of defogger treatment, I used dish soap, let it dry then rub off with a clean towel. The cold weather may pose a challenge with the temperature fluctuations from outside to in.