THIS BT21 FIT ON STICK (KOYA) IS TO SMOOTH OUT BLEMISHES AND REDUCE THE VISIBILITY OF YOUR PORES. IT ACTS AS A PRIMER AND PORE REDUCER ALL IN ONE. IT IS SEE THROUGH AND ACTS A BLANKET TO STOP PORES FROM BEING CLOGGED BY FOUNDATION. HAS A VERY LIGHT AND SILKY FEEL TO IT.