HJC Helmets i50 Poly Solid Off Road Black MEDIUM 57-58 CM (7 1/8" to 7 1/4") HJC's new off-road helmet is designed to create ease and comfort for the rider in an aggressive and attractive design. A large, repositioned eye-port optimizes the view for downward visibility. Dual-position goggle band fitment adjusts for the rider's comfort and preference. The extended visor blocks sunlight and protects the rider from debris and is flexible to allow the material to bend instead of break. The tool-less, changeable mouth vent allows for easy cleaning. ""ACS"" Advanced Channeling Ventilation system allows full front to back airflow to flush heat and humidity up and out, while the SuperCool Interior keeps the rider cool and fresh with moisture-wicking fabric that is removable and washable. The I 50 features SLID (Sliding Layer Impact Distribution), HJC's impact distribution technology. Advanced Polycarbonate Compact Shell: Lightweight, superior fit and comfort using advanced CAD technology. "ACS" Advanced Channeling Ventilation System: Full front-to-back airflow flushes heat and humidity up and out with 13 vent holes to keep riders cool and comfortable. SuperCool Moisture-wicking Interior: Removable and washable. Large Eye Port: For maximum visibility and superior goggle fit. Aggressive and Attractive Design. Functionally Designed Visor: Protects riders from branches and obstacles. Changeable Mouth Vent: Tool-less, changeable mouth vent for easy cleaning. D-ring with Retention Strap Quick-release and adjustable. DOT and ECE Approved.