Grant E One's Hormesis School Mask (Size M). This product was made by the same manufacturer as Grant E One's, as I like Hormesis. It comes with an Ion certification seal. It's large and gives the effect of a smaller face. It can be washed and reused, and the Hormesis effect does not change. It's soft and puts less strain on the ears. There are some areas where the cutting is a little rough (can be cut by yourself).