Note: Please measure your head before placing . Material: ABS engineering plastics for durable, lightweight construction. Size: Head circumference 5659 cm (2223 inches) for a standard adult fit. Padding: Removable and adjustable internal padding for comfort and easy cleaning. Key benefits Durable ABS shell provides reliable protection with minimal weight. The padding can be removed and adjusted for comfort and easy cleaning. Clear sizing runs 5659 cm to help ensure the right fit when is placed. Easy maintenance: padding can be removed for cleaning or replacement. Use scenarios Daily cycling or city commuting, where a comfortable, secure fit matters. Skateboarding or inline skating, benefiting from adjustable padding for snug wear. Home projects or light outdoor activities that require head protection with easy cleaning of the interior. Performance attributes Material efficiency: ABS engineering plastics chosen for strength and light weight. Fit adjustability: interior padding can be adjusted or removed to suit individual comfort. Size consistency: designed to fit heads within 5659 cm circumference.