Rockbros flowing light cycling helmet lightweight protection for every ride the flowing light cycling helmet features an integrated pc eps structure for enhanced impact resistance and head protection. Certified by both ce and national safety standards, it offers trusted performance for your daily rides. Key features: one-piece molded construction: integrated pc shell and eps foam for a compact, shock-absorbing structure ultra-lightweight: weighs only about 270g, reducing pressure while riding superior ventilation: 17 strategically placed air vents for optimal airflow and a dry, cool ride adjustable fit system: knob-adjustable head circumference for a secure and comfortable fit suitable for 54 58cm dual liners included: comes with a silver ion antibacterial liner plus a regular liner for easy swapping removable inner liner: soft, breathable, sweat-absorbent, and washable streamlined design: aerodynamic shape reduces wind resistance multiple color options: stylish looks to match your gear product details: head circumference: 54 58cm weight: approx. 270G materials: pc shell high-density eps foam liner: removable, antibacterial silver ion liner included certifications: ce national standard dual certified