1 3/4" Peak Spring/Summer Colors: 61% Polyester / 39% ModacrylicWhite: 100% PolyesterHeadband: 100% Nylon The Ventair pattern around the outer edge is an iconic Kangol? classic. The 504 cap gets its name from the number assigned to the original block shape that it is made on. The Tropic yarn means that the hat is both lightweight & comfortable.