The Power Rangers are individuals who "morph" from ordinary people into powerful superheroes. They generally wear color-coded battle suits (usually made of spandex or other skin-tight material) and helmets with opaque visors. In many cases, the helmets serve to protect their secret identities. In some cases, more powerful Rangers may have extra shielding on their suits to protect them from strong blows. A morphed Ranger generally possesses superhuman strength, durability, and ability in hand-to-hand combat. Starting with the Disney series, unmorphed Rangers usually possess superhuman abilities such as super-speed or invisibility, attributes somewhat related to their Ranger abilities.