Mattifying beauty products almost always use a combination of Talc, Starch, Silica and Chalk (Calcium Carbonate) to create a "matte" skin finish. We don't like these "technologies" because a) they also bind to water, not just oil, and so are drying which is very different than mattifying; b) some of them are bad for you (search about talc-related lawsuits); c) they don't blend well with many forms of makeup.
Mattifying should not mean drying. In fact, matte skin should be just as comfortable as oily skin. Matte 12 uses advanced elastic spherical polymers that bind to oil but do not make the skin feel dry.