Melin watermelin hat. What makes Melin hats so special? Melin Hats Are 100% Waterproof And not only are these hats waterproof, but they also use a special material that actually repels water. The exceptional composition allows users to stay dry while protecting themselves from the sun. Thanks for taking a look at my listing! Let me know If you have any questions in the comments. ships within 24hours (first thing Monday if over weekend).