Shearling Sheepskin Aviator Winter Hat. Dark curly wool sheepskin interior with a frosted brown napa exterior finish. We use the most expensive sheepskin for this winter winter hat and it shows. The ear flaps have antique brass buckles on the ends twinter hat give this winter winter hat an added touch of style and a great fashion forward look. Designed to be worn with flaps down but can also be neatly folded and buckled up at the crown. This is the Ultimate sheepskin aviator winter winter hat. Exceptional Quality.