F stands for something. Part of the Circa 74 Collection, in the case of the Big F Adjustable Wool Hat, the F stands for quality materials, construction, and a refined silhouette. Featuring an iconic F for Fox graphic, it's a must-have for Big F Fox fans. Exclusive Circa 74 collection. Felt applique embroidery artwork. Adjustable closure. 70% polyester, 30% wool woven. One size fits most.