What is a "beanie"?

A beanie is a type of hat that is typically made of wool or acrylic fabric and fits closely to the head. It is usually knit or crocheted and has a brimless design that covers the ears and forehead. Beanies are often worn as a casual, winter accessory to keep the head warm and can come in a variety of colors and patterns. They are also popular among athletes who participate in winter sports, such as skiing or snowboarding, as they provide warmth and protection from the elements.