The Athletic Cranicaps are composed of 2 layers. The inside layer is a thin layer of cotton fabric. The outer layer is a same material that professional sports jersey's are made of. Browse through our selection of color combinations for a team color that represent your local or professional team. You can "Evolve" your Crani-Mesh hat with a team name or jersey number to add level of personalization. Our Crani-Mesh is truly unique style that we have been doing for quite a few years in Baltimore. This is a unique style that to our knowledge is the only one of its kind.