Striped Beanie
From Inkipedia, the Splatoon wiki
The Striped Beanie is a type of headgear in Splatoon. It is a 2-star item produced by Splash Mob and comes with the main ability Opening Gambit.
This item can be purchased from Cooler Heads for 1,500 Cash.
Appearance
The Striped Beanie is colored a gray-ish blue, with white stripes around the top.