Authentic, purchased at a reputable Sunglass shop for nearly $600 in Miami a couple years ago. It didn’t end up being my style and the bill of the hat got scratched/ scuffed up in luggage- see photos for detail. The bill on the visor is hologram so the scratches are more or less noticeable depending on the lighting. Haven’t looked into fixing this so just selling at a very low price point since it doesn’t work for me anyhow. One size, adjustable band. Includes original box and authentication/ care tags.