The Helmet size would be: Extra Small (54 cm), Small (56 cm), Medium (57 cm), and Large (58 cm), ensuring a perfect fit for different head sizes. Material: The helmet has a High Impact ABS material shell, offering durability and protection. Certification: It is ISI Certified, confirming it meets safety standards. Weight: Weighs 950 grams, slightly heavier but still comfortable. Lining: Features a removable, washable, and odor-resistant lining, helping to keep the helmet fresh for longer between cleanings. Buckle: Comes with a metallic quick-release silent buckle for easy fastening and removal. Visor: The visor is scratch-resistant and UV-resistant, made from optical polycarbonate, and includes a quick-release mechanism for smooth and easy visor changes. Ventilation: The helmet includes 1 Mouth Vent And 2 Back Vent.