Fur is used in traditional, trapper-style hats or cossack hats, which are all-fur hats without ear flaps. Real fur is warm, but it requires professional cleaning.

Fur trapper hats, part of Alaska State Trooper and police uniforms across the state, draw inspiration from the work of Alaska Native skin sewers. ... Yeah, you can freeze your ears,” he said.

Canada's national police force says nothing tops muskrat fur for keeping officers' heads warm in extreme cold. It has issued a tender for 4,470 of its traditional blue winter hats with ear flaps ...