A shower cap is a hair covering typically made from a waterproof material used to keep hair dry while taking a shower. The cap is placed on the head so that the hair is encased inside. Shower caps come in a variety of shapes and sizes, but all do the same job: keeping your hairstyle intact.There are two ways to use a shower cap: the traditional way or the new way. The traditional way is to put the shower cap over your wet hair before you get in the shower. This will keep your hair from getting wet and will help it stay dry. The new way is to put the shower cap on your head after you get out of the shower. This will keep your hair from getting wet and will help it stay dry.No matter which way you choose to use a shower cap, make sure that it fits snugly around your head. If it's too loose, water will still be able to get through and if it's too tight, it can be uncomfortable.