A flame-resistant beanie is a type of hat that is specifically designed to be resistant to flames and heat. It is made from materials that  are inherently fire-resistant, such modacrylic fibers. The beanie is typically a close-fitting, snug cap that covers the head and ears, providing protection from heat and flames.
 
Flame-resistant beanies are commonly used in industries where there is a risk of fire or heat exposure, such as firefighting, welding, and oil and gas exploration. They are also suitable for outdoor activities such as camping, hiking, and skiing, where protection from extreme temperatures and flames is important.