It's a hat. Or a dad cap. Whatever you call it, it looks dope.
Here is what the manufacturer has to say about it:
The Unisex 6-panel Twill Cap is one of our most popular options—it’s perfect for the great outdoors, sporting events, and everyday use. This solid design is 100% cotton twill and will become your go-to hat for years to come. Buckram lining not only makes for easy embroidery but also ensures a classic shape that lasts.
.: 100% Cotton twill
.: 6 panel structure
.: Velcro® closure