size,52-54 cm circumference sample is free of charge sample time: 5-7 days material,cotton twill fashion printing baseball caps: 1.Material:100%Cotton,fabric:16*12 (or other materials as your requirements)2.Size:adult 52CM or according to your requirements3.back closure:adjustable Velcro or metal buckle4.six panels with stitched air holes5.Logo:3D embroidery or printed6.OEM is also accepted7.any ...