New 3D Cutting Five Layers Activated Carbon Filter Replaceable Anti Haze Filter Paper Larger Protection Area(Ship from USA)

Have purchased these multiple times. They fit great in masks that have a filter pocket. Makes the mask sturdier around the mouth area too.

They’re work okay but they’re small

I have the large size mask produced by an online print supplier - I like the masks, but they want way too much for the filters they sell ($10 for a 10-pack) and because I wear glasses, the smaller filters would pretty much direct all my breath into them, fogging em up.These aren't fog proof - but the larger filter coverage and shape fills the mask pocket much better (still a little small for me, but I have a large face). They fit fine and provide a little bit of breathing space between you and the mask. They're more restrictive (more layers) but not uncomfortably so.The downside is that fresh from the package, they have a bit of a 'curing plastic' kind of smell to them - which is pretty obvious when it's in your face, but I'm assuming will eventually go away as the open package airs out a bit. The other downside is the seam at the bottom leaves me too little room for my chin - good enough unless i'm talking, when it gets a little awkward.Cosmetically, I don't like the crease right down the middle, but I expect that will go away as the day wears on. For filters that you need to change frequently, and don't want to spend a ton of money on - I'm quite happy with these.

the size fits regular cloth masks, the only problem is that sometimes is hard to breath

Gives full coverage but the fit inside the pocket is not so smooth. I just place it outside the pocket. It’s fine

The fibers on the part of the filters that touch my face fray and come loose from just breathing and talking after a couple of hours makes your face itchy. I am spending my time scratching. Not cool. Won't buy again.

Much easier to breath with this under my mask. Creates an air pocket under the nose and above the mouth.

Fit right inside cloth masks. Maybe not full proof but for the price it can’t hurt!