Brand: CAIRBULLFeatures: one-piece design / adjustable head circumference size / ultra lightMaterial: PC / lining high density EPSColor: 7 colors are available, as shown in the figure. 7 colors are brightWeight: 195gAir hole: 29 holessize:M code 54-58CM, inner width 17-17.5CM; L code 57-63CM, inner width 17.7-18CM4th Dimension cooling system, large forward air outlet, improve air flow and keep head cool.Slim, soft and lightweight 4X DryLite mesh does not deform with water or sweatThe easy-to-use Super Fit system offers 3 height adjustments with elastic fine adjustment.Unique lightweight belt system for improved wearing safety.High-performance padding design for increased comfort and perspiration.