Marvel, hulk spider-Man, Iron Man, Thor fitted scrub cap. Men surgical scrub cap. Scrub caps for men.

Surgical scrub hat.  Gorros Quirurgicos.

100% cotton, lightweight and washable.  This is a fitted scrub cap. Meaning that the brim does not have to be folded. It lays right above the ear. One size fits most. 

Please note that the brim color may vary depending on availability. It could either be a black brim, or the same fabric all the way around.