I apply it after a bath and while drying my hair. It's thin and soaks up the serum, so it feels like it adheres well, but it does stick to the sides of my nose. It contains vitamin C, but it's not irritating. While this shape may be questionable from a hygienic standpoint, the fact that it can be removed quickly like a tissue makes it easy to use. It takes time to absorb, and if you rely on it too much, it can dry out your skin, so moisturizing afterwards is important.