NFL Kansas City Chiefs Mass Realtree Frost Cap - Fan Favorite. NFL Kansas City Chiefs Mass Realtree Frost Cap - Fan Favorite - Realtree Pattern and great style come together in your officially-licensed NFL Kansas City Chiefs cap from Fan Favorite. The Fan Favorite Mass Realtree Frost style cap sports quality raised embroidered front panel, Velcro woven label strap closure and durable heavy twill fabric. With additional contrasting eyelets you'll agree your team spirit never looked so good! One size fits most age five and up.