The 'Field Trip™' is our most popular hat style with its 5 panel unstructured crown. Its build is derived from our nostalgia for vintage workwear hats. These timeless hats are made of 100% Washed Cotton fabric and features a fabric strap with metal buckle closure. Cotton Fabric Fabric Strap with Brass buckle Clasp. One Size Fits All. Earthy Tones Available Imported.