Cycle King Cap
From Inkipedia, the Splatoon wiki
The Cycle King Cap is a type of gear in Splatoon. It is a 2-star item produced by Tentatek and comes with the main ability Special Duration Up. It can be purchased from Cooler Heads for 2,400 cash.
Appearance
The Cycle King Cap is a hat with polka dots on the side of it, with the Tentatek label printed on the front and another symbol with Splatoon text inscribed on the brim of it. The hat changes color depending on what color the Inkling's tentacles are.