An SPF (sun protection factor) for the hair is a product that is applied before going to the sun for protection from damage and discoloration by the sun. Use SPF before going into the ocean water or the pool.
This product is very important if the hair is chemically treated, colored or highlighted.
SPF may come in a hair spray, lotion and sometimes in a form of leave in conditioner. Some shampoos can claim the same results but its better to apply the sun protection after shampooed, conditioned and towel dryed hair.This product can be applied on wet hair or dry hair.