When sourcing cowboy hats, the material determines both the price point and durability. For felt hats, verify the 'X' marking which indicates the percentage of beaver or rabbit fur blended with wool; higher 'X' values signify better water resistance and shape retention. For straw hats, check the tightness of the weave and the type of straw used, such as Shantung, Panama, or Toyo. Ensure that synthetic leather or polyester versions intended for promotional use meet colorfastness standards to prevent dye transfer when damp.