Hachimaki

A hachimaki (鉢巻, "helmet-scarf") is a stylized headband in Japanese culture, usually made of red or white cloth. They are worn as a symbol of effort or courage by the wearer, especially by those in the military, or to simply keep sweat off of one's face.

In When the Cold Breeze Blows Away, it would be happened and used when most of users are Japanese and located in Japan