Featherweight, not greasy
This is GREAT under makeup - the SPF I usually use is Pharmaceris 50, but it's very thick and leaves my face looking a little too shiny for everyday use. The LaMer 30, though is kind of miraculous - it doesn't leave a trace of shine, and I don't feel sticky afterward.
The packaging is interesting - it's got some sort of shaker in the bottle, and I'm guessing that it's to give a complete, homogenous mix to the product. Worth every penny.