Moon Specialized Adjustable Adult Bike Helmet for Road Mountain Unisex CPSC,Black & Blue Material: High grade Expandable Polystyrene (EPS) and Polycarbonate (PC); Certified by CE EN1078 Appearance: Having a general outlook of a model resembling the head of a python and a basic background pattern of snake scales in a uniform transformation Size and Weight: Large; 58cm - 61cm, 22.83" - 24.02" having a weight of 230g and an adjustable screw to help with a precise fit Additional Information: The high density EPS foam makes you feel more comfortable by generating cushioning effect. There are 22 air vents which allows enhanced air flow making riding cooler . The Snap-on visor for protection is removable making the helmet suitable for road and mountain bikes