Many assume steam irons to be just a market play but no, they are actually good for a valid reason. Steam flat irons are just like the normal ones. They just emit wet heat or vapors when straightening your hair. They are also known as vapor flat iron, equipped with steam technology to style your hair nicely and give them a relaxed feel with less damage. Steam is what can damage and not-damage your hair at the same time. Dry heat damage your hair while wet heat causes no damage. Steam flat irons uses vapor / wet heat on your hair. Human hair is based on two parts, the outer strong smooth cuticle and the internal hollow medulla. When you straight your hair without steam, the ironing only works on the cuticle giving an average result. Now, when you straight your hair with steam, it works on both. Steam flat irons adjust the natural air and moisture present in your hair shaft and ends up with a flat relaxed shape and feel.