Review on 100Pcs PM2.5 Activated Carbon Filter For Cloth Mask - Ship From USA, 5 Layers Replaceable Anti Haze Filters Paper For Reusable Face Cover Outdoor - Anti Fogging Health Protection by Phillip Ellis

My wife and I bought these for our recent Covid-safe vacation along with another set to try. We had our masks for most things, but knew we'd want something else for time at the beach or one of our activities, for which we got gaiters/buffs that allowed for inserting filters - the gaiter/buff being too thin to be fully protective on its own.This set is fine, good even, as far as product. Not being experts and able to conduct full tests of their effectiveness, we go by how they worked in the gaiter/buff and how they look structurally. They lived up to our expectations.However, neither set stayed in the gaiter/buff well - this we place on the design of that product, not the filters.We will continue to use if we need them, but in our masks which seem to hold them better.The one plus the other set had this one does not, hence the 4 stars rather than 5: the other set was wrapped in smaller groupings as well as individually. This product would improve if it too were as such. This allows one to carry extras safe from contamination prior to use.