How to Get Mermaid Waves | If you want to know how to do mermaid waves on short, medium length, or long hair, this post is for you! We've curated the best hair tutorials to teach you how to get beautiful beach waves. We've included tutorials for all kinds of techniques, including how to get mermaid waves with a flat iron and hair waver, plus heatless overnight ideas. We've also included a list of hair products to help ensure your mermaid curls last while also preventing frizzy hair.