100 professional activated carbon filter replacement anti-fog mats, 5-layer anti-fog

Well made, good value. I can’t say the anti fog claim is true - I wear glasses and with filters in mask....they fog up. I don’t think it can be avoided.

You can wear them for more then one day, but since I work in a school, I only wear once in my mask and mask goes in the wash, and I throw the filter away. They fit pretty good inside my mask (has a slit, so I can slide filters in.

These are great filter for my summer and winter mask that have vents. I am claustrophobic and needed mask with breathable valves-this allows both inhaled and exhaled air to be filtered and offering more protection.

My original order took 3 months to arrive, ordered them right at the beginning of Covid19. Now they come much faster. Love having the filter in my mask, gives me more confidence to go out. They do fog my glasses, however, if you lower your glasses above the top of your mask, you will avoid the fogging, most the time. Just have to fiddle around until you find the right level and be able to use the glasses at the same time. Highly recommend the filters.

I wish the description for this product did not say it was anti-fog. I literally had to take it out of my mask because my glasses were fogging up so badly I couldn't see. When I wear my mask without the filters my glasses never fog. I would like to have filters that do what they say so I may have to return them. Don't buy these if you believe your glasses won't fog, they fog more than anything else.

The filter shown was advertised as replacement filter for valve mask/respirator. It did not fit. Wasted $42.00. Disappointed and frustrated. Trying to find a filter that works for the masks I purchased through Amazon a while back. I can not even find the name "seffer" on any of the masks you offer now. Frustrating. Your system does not seem to be set to where a person can rate using a less than star. I only rated a one star because I was not given the option to rate less.

These are good for cloth mask, the only thing is they don't cover the inside of the whole mask.

Blue Cross sent me two cloth masks with openings for these kind of filters. They also sent a few packs but when I ran out I found the same filters (these) on Amazon so I ordered the 100 pack so they'll last for a while before needing more. I also ordered a 50 pack for my sister to try. I'm pleased and feel like they add extra protection,

Para una mascarilla infantil es perfecta, pero resulta estrecha para una de adulto convencional.

Filtros para mascarillas reutilizables. Parecen buenas

Correcto y como se indica

Para reemplazar los filtros en unas mascarillas reutilizables