Air Masks with Mini Air Purifier for Allergy Activated, Dust Mask with Fan Filter Cotton Sheet and Valves Face Masks for Smoke Protection Exhaust Pollen PM2.5 Pollution Respiratory Masks

This face mask came with a pamphlet that shows how to put all the layers together. It was easy to follow. But my mask is missing the inner most layer, which is labeled in the pamphlet as a "Food Grade Silicone Ring". This ring is necessary to form a seal against the face. The mask doesn't sit very tightly and there isn't a very long strip of velcro so it isn't very adjustable. The fan is pretty loud. Would not recommend.

So far, so good! Not good with glasses though, they still fog up. The mask comes up a bit higher than in the product photo. Overall, a pretty ingenious product.

Bueno

Nice product, works as described