Wear the mask with the dark side or cartoon pattern on the outside, and the coil side or KENKOU letters on top.
In the case of a black or white KENKOU mask which has the same color on both sides, look at the ear strap seam and put on the mask with the inside of the seam touching the face.
Pull the elastic of both ear straps and adjust it to fit.
Squeeze the coil to fit the bridge of the nose.
Pull the KENKOU mask to spread until it covers the tip of your chin.