Stiff Sponge; Easily Cleans Hat Surface And Wipes Away Dirt, Dust And Grime; Can Be Used On All Shades Of Hats; Measures Approximately: 2" x3 1/8"; Carefully Rub The Surface Of Hat Until Dirt Balls Up, Then Simply Brush Away; For Best Results, Use Separate Sponge For Light And Dark Colored Hats;