beanie
nounUK /ˈbiːni/
US /ˈbiːni/
A beanie is a soft, warm hat that fits closely on your head.
He pulled his beanie down over his ears before going out in the snow.
OTHER MEANINGS
2. A small, close-fitting cap worn on the top of the head, sometimes as part of a uniform.
The schoolboys wore beanies with the school colors.
3. A propeller beanie, a novelty cap with a small spinning propeller on top.
For the costume party she wore a bright red propeller beanie.
4. A tight-fitting brimless hat worn by some athletes or as casual wear.
The skater kept his beanie on even indoors.