Adult Youth Bike Helmet - Mountain Road Bicycle Helmets For Women Men Teen Kids Enhanced Safety: Complies with U.S. Safety Standards, featuring a sturdy PC shell and high-quality EPS foam for comprehensive head protection. Designed for kids child boy girl teen women men. Perfect Fit: Two sizes available - L, 22.8-24.0 inch(58-61 cm) for adults and M, 21.3-22.8 inch (54-58 cm) for kids aged 5 and older. Choose the right size based on head circumference. Customizable Comfort: Easily adjust the dial and strap to achieve a personalized fit. Suitable for road / mountain cycling and other biking activities. Enhanced Visibility: with two interchangeable visors (black and white) shields your eyes from the sun and rain, providing a clear vision Breathable Design: Stay cool with 23 large vents and special aerodynamics that ensure optimal ventilation, even on hot summer rides. Premium Quality: Meets the U.S. Consumer Product Safety Commission Standard for Bicycle Helmets for Persons Age 5 and Older.