Here's what other sites are saying:
When the Northern winds blow, you don't want just any hat on your head. The REI Knit Aviator Hat will keep you warm and give you a great new look. Polyester/wool exterior combines with knit acrylic earflaps for a stylish look. Polyester lining in the crown has a soft feel, and it enhances warmth and wicks moisture away from your brow. Chin and earflaps are lined with silky soft faux fur for next-to-skin comfort. REI Knit Aviator Hat features polyester-insulated earflaps that offer protection from harsh winds; secure flaps around your chin or atop your head.