No fog on your glasses when you wear mask! This mask has Nose Gap Block which prevents your glasses from getting foggy. It really seals the gap good. You can see the mask inflate and deflate when you breath. This means air is coming in and out through the fabric, not through the gap between the mask and your face. This 3 layer cotton mask has filter pocket for the person who seeks extra protection. Handmade in USA. Ready to ship item is listed on Etsy.