ok product but didn t fit me one size only so may or may not work for you [SEP] these were a great idea when everyone was still wearing cloth masks i m now wearing s when needed these are one size soft plastic inserts so they re probably fine if they fit your face they were too big for me and i couldn t get a comfortable fit it s tricky finding a way to keep them in place in your mask i used a good double sided tape all over the outside the part that would face the mask then put it on my face and put the mask over it to fit it in the right position it works fine but it just never was comfortable for me i have a really small face so it poked too low on my chin or it would ride up my nose and let air out that fogged up my glasses but for the price it s worth a try if you re required to wear a mask it does let you breathe easier and keeps it out of your mouth my mom and pop use these same ones and like them just fine