This helps, not perfect, but helps
Well, masks are a pain for those with glasses, this products HELPS keep the fog from forming. If you stick your head in front of an open oven door - it doesn't help. But minor breathing and minor temperature changes or humidity - it helps. I'd buy again. But they do last a long time if you keep them in the bag zippy. Batman lost his zip bag and it didn't last as long for him.
Rating: 4 stars