Review (4/5): They're too small to work perfectly.
The design is good, but they are just too small. If I don't talk they stay in place, but talking causes them to move up and down on my face, and they don't return to exactly the same spot. They do keep they cloth mask off of my face and nose, but I constantly need to adjust them. If they were bigger, I believe, they would stay on my nose effectively, eliminating movement. Maybe for someone younger they would be perfect.