... cotton twill 2) flat and 3D embroidery on peak, 3) velcro closure on the back Accept OEM, buyer's design ItemSports ... ,Polyester,Lycra etcBack ClosureVelcro back strap with flat embroideryBrass,Plastic ,Velcro,Metal buckle.Any kind of back strap closurePeakPre-curvedSoft or Hard Pre ...