Hi Diana, The reason they say sheer coverage is because when you wear makeup you want to look like you're not wearing makeup. You want to look like it's just your natural beauty. In this sense, sheer is referring to very fine fabric that you can see straight through as if it wasn't there. That's how your makeup will appear, very fine as if it is not there. In a sentence you can say, Diana came to school in a sheer dress. It's sheer because you can see right through it. Let me know if you have additional questions. Best, Faye