Setting spray is used to keep your makeup on throughout the day. It comes in handy on a rainy, hot and humid day. If you go out with your friends, you wanna make sure you have some setting spray so you don’t have to keep checking your makeup. At the same time, you don’t have to wear any. The only thing is that you would have to make sure you have mirror to fix your makeup. I went without setting spray for a long time but I started wearing it when I had longer days and didn’t wanna keep fixing my makeup. Do what is best for you.